 Complete the following phrase:  Many of Istanbuls sports facilities have been built or upgraded since 2000 to bolster the citys bids for the Summer Olympic Games. Atatürk Olympic Stadium, the largest multi-purpose stadium in Turkey, was completed in 2002 as an IAAF first-class venue for track and field. The stadium hosted the 2005 UEFA Champions League Final, and was selected by the UEFA to host the CL Final games of 2020 and 2021, which were relocated to Lisbon 2020 and Porto 2021 due to the COVID-19 pandemic. Şükrü Saracoğlu Stadium, Fenerbahçes home field, hosted the 