Another busy week
John Lam in a stellar performance.The fall season is now at its height, so the week is overflowing with openings and premieres. Last night I caught You Better Sit Down, a meditation on divorce by The Civilians, at ArtsEmerson; tonight I'm back to the Huntington (at the Calderwood Pavilion) for Before I Leave You, the new play by Cambridge resident Rosanna Yamagiwa Alfaro. Thursday I will probably check ou…