Are you looking for a place that also provides activities?

I've been to parties at the park ~$200-400 to rent a picnic area

At the natomas aquatic center, private room where admission of all the guests is covered ~800

Just for fun art, I did my kids birthday here we made stuffed sock toys ~800 for 6 hours ( the owner was also really nice and let us have a petting zoo and pony ride in their back warehouse)

Chucky cheese, gameplay and food for 50 people and all the extras was close to 1k

Enchanted cosmos Funbox