Editor’s note: This article was originally published February 21, 2014

Quantum Collective, a music marketing company, is hosting a free day party on Whole Foods rooftop plaza on Friday, March 14 and Saturday, March 15.

Top billed artists include Lisa Marie Presley, Matisyahu, G. Love and Suzanne Vega. Also performing at the event is Mary Lambert who collaborated with Seattle rapper Macklemore on the track "Same Love." She sang the song with him at the 2014 Grammy Awards in a grandiose performance that included a wedding ceremony for 50 gay and straight couples. The party is a free, all ages event and will run from 10 a.m. to 10 p.m. both days. RSVP here.

Full lineup:

Lisa Marie Presley – Matisyahu - A Great Big World - Bad Things - G. Love - Suzanne Vega – Barcelona - Mary Lambert - Wakey!Wakey! - Boy & Bear - Dirty Vegas - Semi Precious Weapons - Kris Allen - We Were Promised Jetpacks - In The Valley Below - Andrew Belle – Bleaux - The Last Internationale - Queen Caveat - Leopold and his Fiction - OK SWEETHEART - The Growl - Finish Ticket - Leftover Cuties - The Flavr Blue – Keaton Simons & Deantoni Parks’ Best Revenge