Chicago punk act Screeching Weasel will play Philadelphia for the first time in 17 years thanks to Andy Nelson of R5 Productions, which brings the group to the Trocadero (1003 Arch) on April 23 with Lemuria and
the Challenged. It's the band's only East Coast appearance. Their last Philly show, in March 1993 at J.C. Dobbs went on to be released as part of a live/b-sides CD "Thank You Very Little." Frontman Ben Weasel's other band, the Riverdales, will play April 24 at the First Unitarian Church (2125 Chestnut).  Screeching Weasel tickets are $19 and on sale Friday through the Troc, R5 Productions, at AKA Music (27 N. 2nd) or via Ticketmaster.