G.D.
I don't have any referrals, but here are some ideas to check on:
*My daughter-in-law had her 5-yr-old's bday party at a regular gymn during closing hrs. This was in Allen but you might find someone like that in Richardson. The kids loved it and there was plenty of room.
*Check Chikfila on Plano Rd and McDonalds on Buckingham to see what they offer. Both have playgrounds.
*Borrow someone else's larger house that would have been invited anyway
*Rent bounce house so the kids are in there and not crowding the house
GOOD LUCK!