For your buying pleasure this week, we have tickets recently on sale, tickets going on sale in the next few days, or just tickets that, in general, you need to be getting on. >> Who doesn’t know of Chuck Brown, the godfather of D.C. go-go? You know him, you love him, and now you can party down with him at his official birthday bash at the 9:30 Club on August 27. Tickets are just $25;…