Question: Which city in Upper Austria did 2017 European Under-23 Baseball Championship hold

full_context: Document 1: Wachau wine: Wachau is one of Austria's most established and notable wine regions, specializing in dry wines made from Riesling and Grüner Veltliner. Located in Lower Austria along the Danube, west of Vienna and Krems an der Donau, it is one of the westernmost wine producing regions in Austria with only a few scattered plantings in Tyrol being further west. While most of Austria follows a wine classification systems based on ripeness and harvest must weight that parallels the German wine classification system, Wachau wines have a unique classification system. The three classification levels for Wachau wine include "Steinfeder" for wines up to 11.5% alcohol level, "Federspiel" for wines between 11.5–12.5% and "Smaragd" that must have a minimum of 12.5% alcohol level. Despite its renown, the Wachau is a small wine region that usually accounts for only around 3% of Austria's wine production.
Document 2: 2015 UEFA European Under-21 Championship: The 2015 UEFA European Under-21 Championship was the 20th edition of the UEFA European Under-21 Championship, a biennial international football competition for men's under-21 national teams organised by UEFA. The final tournament was hosted for the first time in the Czech Republic from 15–30 June 2015, after their bid was selected by the UEFA Executive Committee on 20 March 2012 in Istanbul.
Document 3: European Under-23 Baseball Championship: The European Under-23 Baseball Championship is a biennial, under-23 international baseball tournament sanctioned and created by the Confederation of European Baseball (CEB).
Document 4: 2001 UEFA European Under-18 Championship: The UEFA European Under-18 Championship 2001 Final Tournament was held in Finland. Players born after January 1, 1982 were eligible to participate in this competition. This championship was the final one to use the Under-18 format; starting in 2002, the event will be known as the UEFA European Under-19 Championship.
Document 5: Salzkammergut: The Salzkammergut is a resort area located in Austria. It stretches from the City of Salzburg eastwards along the Austrian Alpine Foreland and the Northern Limestone Alps to the peaks of the Dachstein Mountains, spanning the federal states of Upper Austria, Salzburg, and Styria. The main river of the region is the Traun, a right tributary of the Danube. The name "Salzkammergut" literally means "Estate of the Salt Chamber" and derives from the Imperial Salt Chamber, the authority charged with running the precious salt mines of the Habsburg Monarchy. It is a UNESCO World Heritage Site.
Document 6: 2017 UEFA European Under-21 Championship: The 2017 UEFA European Under-21 Championship (also known as UEFA Under-21 Euro 2017) was the 21st edition of the UEFA European Under-21 Championship, a biennial international youth football championship organised by UEFA for the men's under-21 national teams of Europe. The final tournament was hosted in Poland for the first time, after their bid was selected by the UEFA Executive Committee on 26 January 2015 in Nyon, Switzerland. The tournament took place from 16–30 June 2017. Players born on or after 1 January 1994 were eligible for the tournament.
Document 7: European Baseball Championship: The European Baseball Championship is the main championship tournament between national baseball teams in Europe, governed by the Confederation of European Baseball (CEB). Italy won the inaugural European Baseball Championship in 1954 , and the competition has since been dominated by the Italian team and the Netherlands' team. As of 2010, it is held every other year, in even-numbered years, with a total of thirty-four European Baseball Championships having been played.
Document 8: Celle: Celle (] ) is a town and capital of the district of Celle, in Lower Saxony, Germany. The town is situated on the banks of the River Aller, a tributary of the Weser and has a population of about 71,000. Celle is the southern gateway to the Lüneburg Heath, has a castle ("Schloss Celle") built in the renaissance and baroque style and a picturesque old town centre (the "Altstadt") with over 400 timber-framed houses, making Celle one of the most remarkable members of the German Timber-Frame Road. From 1378 to 1705, Celle was the official residence of the Lüneburg branch of the dukes of Brunswick-Lüneburg (House of Welf) who had been banished from their original ducal seat by its townsfolk.
Document 9: Linz: Linz ( ; ] ; Czech: "Linec" ) is the third-largest city of Austria and capital of the state of Upper Austria (German: "Oberösterreich" ). It is in the north centre of Austria, approximately 30 km south of the Czech border, on both sides of the River Danube. The population of the city is , and that of the Greater Linz conurbation is about 271,000.
Document 10: Wels: Wels (] ) is a city in Upper Austria, on the Traun River near Linz. It is the county seat of Wels-Land.
Document 11: 2019 UEFA European Under-21 Championship: The 2019 UEFA European Under-21 Championship (also known as UEFA Under-21 Euro 2019) will be the 22nd edition of the UEFA European Under-21 Championship (25th edition if the Under-23 era is also included), the biennial international youth football championship organised by UEFA for the men's under-21 national teams of Europe. The final tournament will be hosted in Italy and San Marino in mid-2019, after their bid was selected by the UEFA Executive Committee on 9 December 2016 in Nyon, Switzerland.
Document 12: European Junior Baseball Championship: The European Junior Baseball Championship is a biennial, under-18 international baseball tournament sanctioned and created by the Confederation of European Baseball (CEB). The tournament is conducted in the year prior to the 18U Baseball World Cup (formerly called the World Junior Baseball Championship), which is likewise held every other year. The top 4 teams in the European Junior Baseball Championship qualify for the World Cup.
Document 13: Velliscig: Velliscig (also view the variants) is an Austrian/Italian surname which is derived from the German name Welisch and the Czech name Velis. Its origins can be traced back to a German noble family which lived in Bohemia (now Czech Rep). In the 16th century, some members of this family moved to the village of Velindol, which is near the town of Gorizia, Italy. According to research conducted, the surname Vellsicig may derive from the noble family Velišovští z Velišova
Document 14: 2017 European Under-23 Baseball Championship: The 2017 European Under-23 Baseball Championship was an international baseball tournament held by the Confederation of European Baseball for players 23-year-old and younger. The 2017 edition was be held in Austria (Wels), Czech Republic (Blansko and Brno) and Slovakia (Trnava). The Dutch team won the first ever edition.
Document 15: Oberwesel: Oberwesel is a town on the Middle Rhine in the Rhein-Hunsrück-Kreis (district) in Rhineland-Palatinate, Germany. It belongs to the "Verbandsgemeinde" of Sankt Goar-Oberwesel, whose seat is in the town.
ground_truth: Wels