Weatherman says to plan indoor activities this Mother’s Day (it’s going to rain), so here’s an idea: celebrate mothers, grandmothers, great-grandmothers, godmothers, step-mothers, and anyone else by dancing to BLUE BAMBOO — Elke Baker on fiddle, Barbara Heitz on flute, John Devine on guitar, Marc Glickman on piano and Ralph Gordon on bass. Never waltzed before? No problem. There’s a beginner lesson at 2:45, included with admission of $13 per person ($5 with valid student ID), payable at the door, cash or check (sorry, no credit cards). Dancing from 3:30-6:00. Come on out, gentlemen; all those motherly types need partners. ALL are welcome!