The autographed drawings feature Julie Andrews, Ellen Greene, Brian Stokes Mitchell, Bernadette Peters, Chita Rivera, Lea Salonga, and more.
Alan will be featured at the piano for the evening titled The Old and The New.
The Tony nominated musical cancelled its evening May 8 performance in response to the tragedy.
Circus designer Shana Carroll and star Isabelle McCalla on the show's gravity-defying acrobatics.
Outgoing Lincoln Center Theater Artistic Director André Bishop will also receive the inaugural William Wolf Award.
Broadway's biggest night of the year is set for June 16.
In addition to the six competitive awards, honors will be presented to Marylouise Burke, Len Cariou, Suzan-Lori Parks, and more.
Jodie Prenger and Bobby Delaney have again teamed up to write the holiday pantomime.
Featuring a book by Sarah Ruhl, the stage adaptation of the 1957 film will play London's Young Vic Theatre.