You may make a reservation for the concert by sending an email to: email@example.com, giving the name or date of the concert, the number of seats you want, and your name (and other information if you wish.) The reservation will be held until 7:20 and then cancelled. A reservation (if you come and get a ticket by 7:20) guarantees you a seat at the concert.
You should get an acknowledgement within a day. If not, contact Diane at 413-336-2589.