I sent a letter and SAE with US stamp on to the stage manager on: 6th February 2015, and a few weeks later, I recieved this signed playbill back, with letter asking that in return, make a donation to charity, which i have done.
address I used was:
Stage Manager of ' Constellations',
Samuel J Friedman Theatre,
261. West 47th Street,
New York
NY 10036
USA