Unfortuntely Chirp groups host Chirp.social is officially shutting down. If you're running a Chirp group, now is the moment to move your members to another group platform on the Fediverse.
The maintainer of Chirp recommends moving to Guppe, which is the most popular Fediverse group host. Another option is Friendica which lets you have group-specific moderators.
More info about using Fediverse groups in a guide at:
I tried out #friendica for a #group. I may have not been diving deep enough into the many options, but from the mastodon webinterface, I can't read the posts of the group. I guess, the posts are retooted to members also on mastodon, but their aggregation is not visible unless you at least visit friendica.
Guppe seems fast and smooth. It has no way to enhance the group description though (unless you set up your own server and alter the code I guess; it is open source).