Yes, I have two grads and one currently in SLHS. All were in the marching band, youngest is out for this year due to a scheduling conflict. This is the schools first winning (by winning I mean more wins then loses - we usually win one or two games all year) football season we've probably had in 30 years so everyone is turning out for the games.
Hmmm, I think it's harder to get friends without the kids as an ice breaker. If you like to read, there is a great book club at the library:
Upcoming Events @ the Southern Lehigh Public Library with participants of all ages. There's a Friends group there and they do a lot of fun activities. They just sponsored a mini golf tournament at Putt U this past weekend and will be doing an all day promotion at Barnes and Noble in December.
The School district has a fund raising group that might interest you:
Community I think they are always looking for new blood. (What volunteer group isn't??)