Let special interest groups share their passion for a purpose - your playspace! Invite interest groups to donate an item for a raffle or silent auction.
Interest groups may want to share their special interest as part of your children's activities on build day . Perhaps they could bring a puppy or antique car for children to see/explore.
These groups might be able to hook you up with vendors who can contribute to your project, (i.e., veterinarians, mechanics, etc.).
Add more ideas by clicking the "Edit" link above!