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“Forever Plaid” is sweet, slick, funny nostalgia focusing on a guy group quartet of the ’50s and ’60s that gives a comeback concert. Ross Wheeler, Paul Pement, Elic Ryan Bramlett and Erik J. Boyd star. At the Royal George Theatre, 1641 N. Halsted St. $32.50-$39.50. Through April 29. 312-988-9000.
