Sports and Music Event Photographers?

Hi, does anyone know of any sports events that accept volunteer sports photographers? Or maybe concerts as well? I don’t have any experience in concert photography yet, but I’d really like to try it. Sports photography, though, is actually my profession back overseas.

I’m just wondering if anyone knows of events or organizations where I could volunteer or connect with people in that field (sports or music events). Would love to connect with people in the industry too. Thanks!