Personal projects are any exkayendays that aren't official projects.
Announce the projects you're doing by yourself, find a group to join, or make your own group.
You'd say something like Looking for buddies for a 50K30Day involving werewolves and fae. Starting October 3. Would like 4 or 5 more people to join.
Then you can discuss your progress in that thread or take it to discourse or email if you want.