On May 31, 2008, a tribute to honor the life and work of Jim Gray will be held at UC Berkeley. There's a technical session, for which registration is required, preceded by a general session that is open to the public. As the invitation email I received (thanks Elein!) states:

This is not a memorial, because Jim is still listed as missing, and will be so listed until about Jan 28, 2011. It is important that it is not referred to as a memorial, because it can't be a memorial until then. We believe that it is good to go ahead and recognize Jim's contributions, to honor him in a Tribute, before such a long time has passed.