desperate!

HI everyone -

I was wondering if any of you girls know of a place in Suffolk County that is located outside but has a tent or an overhang that can be rented for an engagement party? we have over 100 people. We really wanted a backyard party with tents but my fiance's family is huge and we won't fit in my parents backyard. we looked into hoyt farm but that didn't work out either. do you have any suggestions? most parks dont have tents. please let me know.thanks