Ready to start planning for the fall? Go-go vets Rare Essence have announced a 31st anniversary show, “Past, Present & Future Reunion,” that will take place Saturday, Sept. 11 at the Hyatt Regency Crystal City. Old-school RE members such as James Funk and Donnell Floyd will be there, and they’ll be paying tribute to members of the RE family who are no longer with us, such as members Footz Davidson and Lil’ Benny Harley, and their first manager and longtime go-go supporter, Annie Mack. Yours truly fondly remembers seeing these go-go pioneers way back when with an elaborate stage set at the old Capital Centre, as well as on a small plain stage jammed under a tent on the mall at the Smithsonian Folklife Festival. This reunion gig is billed as “a grownup sexy atmosphere for mature clientele.” That means “no athletic wear,” say the promoters, and of course, such steps are  intended to help prevent any of the trouble that has sometimes occurred in connection with go-go shows in the area.  If you can’t wait till September (or want to compare the approach of the 21st century RE with earlier versions), the current incarnation of RE plays every Friday at the Tradewinds in Temple Hills, Md., and every Saturday at the Gallery, in Silver Spring, Md.