Question: When was the Excalibur built in the city where the contestants performed additional rounds in the 10th and 11th seasons?

full_context: Document 1: MGM Grand Las Vegas: The MGM Grand Las Vegas (formerly Marina and MGM - Marina) is a hotel and casino located on the Las Vegas Strip in Paradise, Nevada. The MGM Grand is the largest single hotel in the United States with 6,852 rooms. It is also the third - largest hotel complex in the world by number of rooms and second - largest hotel resort complex in the United States behind the combined The Venetian and The Palazzo. When it opened in 1993, the MGM Grand was the largest hotel complex in the world.
Document 2: The Linq: The Linq (formerly Flamingo Capri, Imperial Palace and The Quad) is a 2,640 - room hotel, casino and shopping promenade on the Las Vegas Strip in Paradise, Nevada. It is owned and operated by Caesars Entertainment Corporation. As of 2012, the casino is 32,890 sq ft (3,056 m) with 830 slot machines, 55 table games, and a race and sports book.
Document 3: Excalibur Hotel and Casino: Excalibur Hotel and Casino is a hotel and casino located on the Las Vegas Strip in Paradise, Nevada, in the United States. It is owned and operated by MGM Resorts International.
Document 4: Luxor Las Vegas: Ground was broken for the Luxor in March 1992 and the resort officially opened at 4 AM on October 13, 1993, to a crowd of 10,000 people. When it opened, the pyramid, which cost $375 million to build, was the tallest building on the strip and contained 2,526 rooms and a 100,000 sq ft (9,300 m) casino. The resort was financed by ``petty cash ''earned from other Circus Circus Enterprises properties and did not include any outside financial investors. The hotel's pyramid is similar in size to the Red Pyramid and Bent Pyramid of Egypt.
Document 5: American Idol: The finals are broadcast in prime time from CBS Television City in Los Angeles, in front of a live studio audience. The finals lasted eight weeks in season one, eleven weeks in subsequent seasons until seasons ten and eleven which lasted twelve weeks except for season twelve, which lasted ten weeks, and season thirteen, which lasted for thirteen weeks. Each finalist performs songs based on a weekly theme which may be a musical genre such as Motown, disco, or big band, songs by artists such as Michael Jackson, Elvis Presley or The Beatles, or more general themes such as Billboard Number 1 hits or songs from the contestant's year of birth. Contestants usually work with a celebrity mentor related to the theme. In season ten, Jimmy Iovine was brought in as a mentor for the season. Initially the contestants sing one song each week, but this is increased to two songs from top four or five onwards, then three songs for the top two or three.
Document 6: WinStar World Casino: WinStar World Casino and Resort is a hotel and casino located near the Oklahoma -- Texas state line, 1 mile (1.6 km) north of the Red River, at Exit 1 and Exit 3 off Interstate 35 in Thackerville, Oklahoma. The casino opened as the WinStar Casinos in 2004, and was expanded (with a 395 - room hotel tower) and renamed WinStar World Casino in 2009, with its 600,000 square feet (56,000 m) of casino floor making it the world's largest casino. In August 2013, WinStar Resorts completed a major expansion project, which added a new 1000 - room second hotel tower that was divided into two phases; this also added a new casino that is attached to the tower. As a result of the completion of this expansion, the casino overtook Foxwoods Resort Casino to become the largest casino in the United States and the second largest in the world based on gaming floor space. WinStar has over 7,400 electronic games, 55 table poker rooms, 99 total table games, Racer's off - track betting, High Limit Room, keno, and bingo.
Document 7: American Idol: The most popular contestants are usually not revealed in the results show. Instead, typically the three contestants (two in later rounds) who received the lowest number of votes are called to the center of the stage. One of these three is usually sent to safety; however the two remaining are not necessarily the bottom two. The contestant with the fewest votes is then revealed and eliminated from the competition. A montage of the eliminated contestant's time on the show is played and they give their final performance. However, in season six, during the series' first ever Idol Gives Back episode, no contestant was eliminated, but on the following week, two were sent home. Moreover, starting in season eight, the judges may overturn viewers' decision with a "Judges' Save" if they unanimously agree to. "The save" can only be used once, and only up through the top five. In the eighth, ninth, tenth, and fourteenth seasons, a double elimination then took place in the week following the activation of the save, but in the eleventh and thirteenth seasons, a regular single elimination took place. The save was not activated in the twelfth season and consequently, a non-elimination took place in the week after its expiration with the votes then carrying over into the following week.
Document 8: American Idol: Once in Hollywood, the contestants perform individually or in groups in a series of rounds. Until season ten, there were usually three rounds of eliminations in Hollywood. In the first round the contestants emerged in groups but performed individually. For the next round, the contestants put themselves in small groups and perform a song together. In the final round, the contestants perform solo with a song of their choice a cappella or accompanied by a band‍—‌depending on the season. In seasons two and three, contestants were also asked to write original lyrics or melody in an additional round after the first round. In season seven, the group round was eliminated and contestants may, after a first solo performance and on judges approval, skip a second solo round and move directly to the final Hollywood round. In season twelve, the executive producers split up the females and males and chose the members to form the groups in the group round.
Document 9: American Idol: The wildcard round returned in season eight, wherein there were three groups of twelve, with three contestants moving forward – the highest male, the highest female, and the next highest-placed singer - for each night, and four wildcards were chosen by the judges to produce a final 13. Starting season ten, the girls and boys perform on separate nights. In seasons ten and eleven, five of each gender were chosen, and three wildcards were chosen by the judges to form a final 13. In season twelve, the top twenty semifinalists were split into gender groups, with five of each gender advancing to form the final 10. In season thirteen, there were thirty semifinalists, but only twenty semifinalists (ten for each gender) were chosen by the judges to perform on the live shows, with five in each gender and three wildcards chosen by the judges composing the final 13.
Document 10: Flamingo Las Vegas: The property includes a 72,299 - square - foot (6,716.8 m) casino along with 3,626 hotel rooms. The 15 - acre (6.1 ha) site's architectural theme is reminiscent of the Art Deco and Streamline Moderne style of Miami and South Beach. Staying true to its theme, the hotel includes a garden courtyard which serves as a wildlife habitat for flamingos. The hotel was the third resort to open on the Strip and remains the oldest resort on the Strip in operation today. The Flamingo has a Las Vegas Monorail station called the Flamingo & Caesars Palace station at the rear of the property. After opening in 1946, it has undergone a number of ownership changes.
Document 11: Excalibur Hotel and Casino: Circus Circus Enterprises constructed Excalibur which opened on June 19, 1990, as the largest hotel in the world, with over 4,000 rooms, covering over 70 acres. As of 2016 it is the seventh - largest hotel (by total number of rooms) in Las Vegas, and the eleventh - largest hotel worldwide. MGM Resorts International purchased the property in 2005.
Document 12: Park MGM: The Monte Carlo Resort and Casino is a megaresort hotel and casino on the Las Vegas Strip in Paradise, Nevada, United States. The hotel, with a height of 360 ft (110 m), has 32 floors, featuring a 102,000 - square - foot (9,500 m) casino floor with 1,400 slot machines, 60 table games, and 15 poker tables. It is owned and operated by MGM Resorts International. The hotel offers 2,992 guest rooms, including 259 luxury suites. It is being converted from late 2016 to 2018 into the Park MGM, with the upper floors converted into a boutique hotel, NoMad Las Vegas.
Document 13: American Idol: In the audition rounds, 121 contestants were selected from around 10,000 who attended the auditions. These were cut to 30 for the semifinal, with ten going on to the finals. One semifinalist, Delano Cagnolatti, was disqualified for lying to evade the show's age limit. One of the early favorites, Tamyra Gray, was eliminated at the top four, the first of several such shock eliminations that were to be repeated in later seasons. Christina Christian was hospitalized before the top six result show due to chest pains and palpitations, and she was eliminated while she was in the hospital. Jim Verraros was the first openly gay contestant on the show; his sexual orientation was revealed in his online journal, however it was removed during the competition after a request from the show producers over concerns that it might be unfairly influencing votes.
Document 14: American Idol: In seasons ten and eleven, a further round was added in Las Vegas, where the contestants perform in groups based on a theme, followed by one final solo round to determine the semi-finalists. At the end of this stage of the competition, 24 to 36 contestants are selected to move on to the semi-final stage. In season twelve the Las Vegas round became a Sudden Death round, where the judges had to choose five guys and five girls each night (four nights) to make the top twenty. In season thirteen, a new round called "Hollywood or Home" was added, where if the judges were uncertain about some contestants, those contestants were required to perform soon after landing in Los Angeles, and those who failed to impress were sent back home before they reached Hollywood.
Document 15: America's Got Talent: During the live shows, a group of acts ranging from only a Top 20 (season two), to as many as 60, compete for viewers' and judges' votes. In the first season, the judges could not end an act's performance, but could either ``check ''or`` X'' the performance during their critique. Since season two (2007), judges have been able to end an act's performance early, and the ``check ''was removed. Generally, acts each perform first in a live round consisting of a series of quarterfinals. In seasons with YouTube auditions, the round of live judging of YouTube finalists takes place then, as part of these quarterfinals. Then there may be additional shows for`` Wild Card'' acts -- acts that one or more of the judges select to be given one more chance for audience vote despite previous elimination. From these shows, the existing group is narrowed through votes by the public and / or the judges (depending on the season). Acts then move on to a semifinal round, and even further rounds (such as a ``Top 8 ''or a`` Top 10'', depending on the season) through a series of weekly shows, which trim the number of acts down each time based on a public vote. In the majority of seasons, judges have had no vote from the semifinals. All these rounds culminate in a live final, which has consisted of anywhere from four to ten acts throughout the seasons. The act with the most votes is declared the winner, given $1 million, and, since season three (2008), a chance to headline a show on the Las Vegas Strip.
ground_truth: 1990
sub_queries: In what city did contestants perform an additional round in seasons ten and eleven? Answer: Las Vegas
when was the excalibur built in Las Vegas Answer: 1990