We have Theology on Tap a few times a year too, I wish we'd do it more! What better way to reach people who might otherwise assume all Catholics are starchy fuddy-duddies that think they're better than everyone else than to gather in some dank bar and have a group chat about our faith without shame?
I'm falling off the outside edge of "young adult", but I'm part of a group that invites new independant parishoners - basically anyone under 40 who move to the area for work or who come home to the Church after an extended absence - to hang out with us. We'll plop all the kids in front of the TV and have a bonfire and talk about whatever or we'll go out to dinner or watch a big game together.
I'm also part of an informal men's Catholic Bible Study that meets at a local pub for a couple hours every Tuesday night. We start off with a prayer, re-read the chapter for the week together, then talk about it. We go off on tangents quite a bit, but that's part of the fun. The youngest participant is 22 (sometimes 15 if one of the men brings his son) and the oldest are in their mid-50s. The struggles of a 15-year-old and a 55 year-old aren't as different as it might immediately seem. Some of us are married, some single,, some divorced. Some conservative, some liberal. It is absolutely amazing how well it works out.