It's a party years in the making: The RiffTrax guys (Michael J. Nelson, Kevin Murphy and Bill Corbett) reunite with most of the original cast of Mystery Science Theater 3000 (Joel Hodgson, Trace Beaulieu, Frank Conniff and Mary Joy Pehl) in honor of MST3K's imminent return with new host Jonah Ray (who will also be present). The gang will pair off in small groups to take turns savaging a selection of educational films, as well as perform some of their bizarre comic interludes. Rifftrax Live: MST3K Reunion is broadcast live from Minneapolis (where else?), and you can see it locally at 7 p.m. at Wehrenberg Des Peres 14 Cinema (1270 Manchester Road; www.fathomevents.com). Tickets are $15.