Opening concert of the Prague Spring on 12 May 2021 was indeed a milestone in the history of Collegium 1704. Conducted by Václav Luks, Collegium 1704 performed the cycle of symphonic poems Má vlast by Bedřich Smetana. The concert was broadcasted live on Czech TV Art and Czech Radio Vltava, the recording will be available on YouTube for one year.https://www.youtube.com/watch?v=F6-CttlBs4M&t=386s
The broadcasts of the concerts of the 76th Prague Spring International Music Festival reached more than half-million spectators. The unique peak to the backstage preparations of the opening concert was captured by the short documentary directed by Kateřina Hager Smetana de Luks.https://www.youtube.com/watch?v=qBSU9sZcds4&t=3s
Reviews of the concert available here.