Grammy organizers were expecting Lauren Hill to make a surprise appearance during The Weeknd’s performance Monday night, but the singer was a no-show.

Recording Academy President Neil Portnow said Hill showed up for a dress rehearsal Monday morning but left and didn’t come back.

“We were ready up until the moment of the downbeat of that performance for her to step on the stage,” Portnow said, addressing one of several unexpected moments during Monday’s telecast.

Hill’s rep says the singer had concerts all weekend, which left her no time to prepare for the Grammys.