There’s the Male Feet and Tickling Network, a Facebook-esque social network for men into feet. What other sites, groups, or resources have you tried? FetLife surely has groups and message boards you can peruse. So the sex apps are not leading you anywhere, and Craigslist is always a (sometimes literal) crap shoot. A cursory googling unearthed something called Chicago Footies Foot Party at Cell Block in Boystown.
I don’t know what specific party you’re talking about, but if “feet” has its own category on PornHub’s gay channel, then it can’t be impossible to find dudes into your kink.