Yeah, this is a ‘lets organize stuff’ sort of place, but the UbuntuForums are the old school water cooler of the community, so that would be the best place to start! And we also have a newer, unofficial counterpart in the UbuntuHideout, which is an active Discord server with all kinds of channels for hobbies and interests.
I am absolutely horrible at fantasy sports, because I never ever update my roster, but I would start on the Forums first! I might also bring it up in our work channels, because that could be a fun way to connect the Canonical and volunteer sides of our communities!