Lots of possibilities: Local churches (where young adults go), philosophy groups, search around on billboards and campuses, yoga classes (ie. Art of Living), etc. Some groups are open to newcomers. Just keep in mind, many groups try to suck you in and you may need to review why and if you should continue from time to time. Any place you start, you might connect to people drawn to you, so could end up in a different group after some time.