*No advance purchase. Subject to availability. Restrictions may apply. Offer valid only at box office. Cash only at some venues. Offer may be revoked at any time. Not valid on prior sale. Cannot be combined with any offers. This offer is valid only from 9/5/16 – 9/25/16. 20at20 is a project of The Off Broadway Alliance (OBA), a non-profit corporation organized by theater professionals dedicated to supporting, promoting and encouraging the production of Off Broadway theater and to making live theater increasingly accessible to new and diverse audiences.