Do I have to pay or call someone to have a party there?

Yes! Baltimore Parks And Recreation.

Yes Baltimore City recreation and parks

To rent a pavilion yes you do have to pay

☝️

All of the above

If you want a pavilion yes, if you want to just go spread a blanket like people use to, and have fun you don't have to pay. Take your FAMILY have a picnic and ENJOY yourself

Yes , Dept. Rec and parks