Such a bummer that I'm going to miss this show centered on The People United will Never be Defeated (El pueblo unido, jamás será vencido!, or 不屈の民 in Japanese), but you should definitely go. Iwai Satoki, Takeda Kenichi (leader of A-Musik), Okuma Wataru, with Kogure Miwazo playing chindon-ya percussions. And you're welcome to join with instruments or singing.
Jan 4 (Sat), 2025, Giee at Kokubunji (about 30 minutes from Shinjuku)
https://giee.jp/calendar/6052708
Would definitely love to go and sing this Cantonese version sung in the 2019 Hong Kong Protests :
https://youtu.be/-RhjakiC09A