The first performance of Sinfonia Concertante was on 17 May. Here is the publicity flyer and the concert programme.
Below are various videos and materials related to the publicity for the concert.
1) An interview with the soloists, with excerpts from the cadenza.
2) My video message (in Japanese).
3) YouTuber naco-san introducing the concert in her live-stream on 18 April (watch from about 02:11:00. I make a brief appearance at around 02:17:30).