The ceremony in Public Hall is sold out but the simulcast is available. Here's the official word:
Tickets go on sale today for the Rock and Roll Hall of Fame and Museum’s live broadcast of the 27th Annual Rock and Roll Hall of Fame Induction Ceremony on Saturday, April 14 at the Rock Hall. Doors open at 7 p.m., show starts at 8 p.m. Other than at Public Hall, the simulcast will be the only place to watch the Induction Ceremony live on the night of the event.
Tickets to the Induction Simulcast are $20 and are available now at rockhall.com and at the Rock Hall Box Office.
The Rock and Roll Hall of Fame and Museum will simulcast the 3+ hour ceremony, including the performances and presentations. The broadcast will be on a giant 12-foot screen on the Museum’s Main Stage and several large screens throughout the Museum’s theaters. All exhibits will be open to tour during the event, including the Museum’s newest exhibits, the Grateful Dead: The Long, Strange Trip and the 2012 Hall of Fame Inductees exhibit.