On Android, I am using Thunderbird connected via IMAP, and using CalDAV with DAVx5 to sync my calendar. On desktop, when I receive a calendar invite to Thunderbird, I am able to accept/decline. However, on Android, I have no option to Accept/Decline. I believe this is because on desktop, Thunderbird has a calendar client, while on Android it doesn't.
But this is crazy to me. I am struggling to find a way to accept invites on mobile.
I've been reconnecting with old friends, and keeping together with current friends through board games and such. One highlight was Codenames, lots of laughs and stuff. I highly recommend it for its collaborative nature that's more focused on language interpretation than skill like in chess.