About 20 people are going to barbecue. Do I need permission?

No. You don't need permission for using the grills at the park. You just have to arrive early to separate one. There is many people during the summer using the grills provided.

I do not know. I just walked to my picnic place with my friends and got 20-30 dogs to prepare food. We never had a problem. The park tends to be very busy from April to October. ypu must arrive early in the field to find a good comfortable place in the unfair wood. enjoy it!