It would be best to contact the park. Parties for day use can handle that big of a crowd. Overnight camping might create a problem for that many.
Call the park and ask about camping as They do have a camp ground. You can bring as many people as you like as long as you pay $5 per person. If its an event, they may have a special function rate.
Call the park office
I'm pretty sure they can accommodate your group. They have plenty of camping spots.
Thanks! Your answer is awaiting moderation.