OK so I seem to have forgotten about March. There are plenty of cool things going on in April. I'll start with a couple and I and others will add on.
I recently saw an interesting off Broadway production of I Remember Mama in the Village. It is still playing through mid-April
I grew up looking for Ninas in the Al Hirschfeld Sunday New York Times theatre section. There is a small FREE Al Hirschfeld exhibit on view until April 10th at Syracuse House.