Parkave1… have the town provide you a hardcopy of the law/ rule as to why there are no vendors allowed in Parks.
No Hot Dog Carts.. that’s fine! Show up with a table, propane steamer and some coolers. LOL.
You could organize all of the non profit groups that use the parks to request exemtion from the rule since the majority of the groups are made up of local tax payers. You might have to negotiate a cut with the leagues but at least you will be their official vendor.