Conversation so far:
When did some of these memorial events for Ahmet Ertegun take place?
A memorial service for Ahmet Ertegun was held in New York on April 17, 2007.
Who attended the Ahmet Ertegun memorial?
Wynton Marsalis, Eric Clapton, Ben E. King, Sam Moore, Stevie Nicks, Crosby, Stills, Nash & Young, and Phil Collins honored Ahmet Ertegun at his memorial.
Who were some other attendants of Ahmet Ertegun's memorial?
Solomon Burke, Jerry Leiber, Mike Stoller, Keith Emerson, Peter Asher, Spencer Davis, Phil Carson, Taylor Hackford and Martin Lewis honored Ahmet Ertegun at a memorial documentary screening.

Question: Were there multiple memorial events?
Self-contained rewrite: Were there multiple Ahmet Ertegun memorial events?