Sure, for one category of music in some cities there's a resource. There are often community-curated lists that have some things, but if you want specific things or if you want everything/most things, it's the big platforms.

I'm part of some local photography groups. There's a Discord where members plan informal get togethers, but the big events are all posted on Instagram.

I follow a number of local bartenders, and their popup events are all on Instagram. Same for local performing artists.

My bike club coordinates through a Facebook page.

Honestly, none of my non-tech interests are viable (in a group setting) without Meta properties.