Herrick Lake would be a good choice to hold any bbq's... i would of suggested Blackwell FP (the one with the huge hill, haha) but considering that one actually has staff that watch it regularly, I'm guess that would be a no...
Tom's place IS pretty big, I think that would be a great place to meet up and then head over to that sandwich place from there, it'd be like free advertising for the restaurant. Would be really cool if say like we found a huge a** parking lot and could have like 103.5 KISS FM or B96 there hosting it, then I'm sure TONS of girls would come, haha!
Lastly, I still think Hooter's isn't that bad of a meeting place, however a Portillo's would probably be easier on everyones budget. Anyone ever rented out DuPage Country Fairgrounds before? I'd be interested in checking that out, charge maybe $4 or $5 to get in there to help pay for the park, everyone could bring BBQ's and I'm sure someone has DJ connections of some sort, might be a fun idea... I could definitely see a radio station coming then, haha! "Chicagoland ILGPC Day", haha!