Question: When was the arena that hosted the 2015 Audi quattro Cup officially opened ?

Context articles: 2015 New Zealand Winter Games
2015 Audi quattro Cup
Audi Quattro
2015 Audi Sport TT Cup
Red Bull Arena (Salzburg)
Audi quattro concept
Audi Coupé (B2)
2015 Audi Cup
Audi Quattro Trophy
Stig Blomqvist

The 2015 New Zealand Winter Games was the 4th edition of the New Zealand Winter Gameswas contested August 21 through August 30 in the cities of Naseby, Queenstown, and Wanaka.
 A total of 35 events across 5 disciplines will be contested, as well as a night parallel slalom to be contested during the opening ceremony.
 The event is officially called the Audi quattro Wintergames.
The 2015 Audi quattro Cup (also known as the Audi quattro Cup presented by SalzburgerLand for sponsorship reasons) was inaugural edition of mini men's football friendly tournament at the Red Bull Arena in Salzburg.
The Audi Quattro is a road and rally car, produced by the German automobile manufacturer Audi, part of the Volkswagen Group.
 It was first shown at the 1980 Geneva Motor Show on 3 March.
 Production of the original version continued through 1991.
The 2015 Audi Sport TT Cup season was the inaugural season of the Audi Sport TT Cup, a one-make sports car racing series organised by Audi.
 It began on 2 May at Hockenheim and finished on 18 October at the same venue after six double-header meetings, all of which were support events for the Deutsche Tourenwagen Masters.
The Red Bull Arena (] ; known for UEFA Euro 2008 as the EM-Stadion Wals-Siezenheim ] and during UEFA club football events as Stadion Salzburg) is a football stadium in Wals-Siezenheim, a municipality in the suburb of Salzburg, Austria.
 It was officially opened in March 2003 and is the home ground of Red Bull Salzburg.
 Previously, the club played at Stadion Lehen.
The Audi quattro concept is a concept car produced by Audi and presented at the Paris Motor Show in 2010.
 It commemorates the 30th anniversary of the original Audi Quattro and the Audi quattro four wheel drive system.
 Based on the Audi RS5, it features a modified 2.5L five-cylinder TFSI engine and the sixth generation of quattro transmission.
 It had been reported that Audi are considering a limited production model (200–500 cars) based on the quattro concept, but the project was shelved in 2012.
The Audi Coupé (B2, "Typ" 81/85) was a two-door coupé produced and sold by Audi from 1980 to 1988.
 It was offered as a less expensive version of its turbocharged, permanent four-wheel drive Audi Quattro without turbocharger(s) or four wheel drive.
 Later, quattro was added as an option ("Typ" 85).
 "Typ" 81 was the internal model code for front-wheel drive Audi Coupés.
The 2015 Audi Cup was the fourth edition of the Audi Cup, a two-day association football tournament that featured four teams and was played at the Allianz Arena in Munich, Germany.
 The competition hosted the 2009 Audi Cup winners Bayern Munich, the 2014 UEFA Champions league winners Real Madrid, 18-time Italian champions Milan, and eight-time FA Cup and two times UEFA Cup winners Tottenham Hotspur.
The Audi Quattro Trophy was a golf tournament on the Challenge Tour.
 It was played from 1989 to 1998 in Germany.
Stig Lennart Blomqvist (born 29 July 1946) is a Swedish rally driver.
 He made his international breakthrough in 1971.
 Driving an Audi Quattro for the Audi factory team, Blomqvist won the World Rally Championship drivers' title in 1984 and finished runner-up in 1985.
 He won his home event, the Swedish Rally, seven times.