I recall reading an interview with Phil Johnstone (Robert Plant's co-writer/bandmate from "Now And Zen") in Musician Magazine where he stated that he videotaped the jam at Jason's wedding. The interview focused on the "Now And Zen" release, but there were interesting tangents (like the wedding story). After telling the story, he joked that someday the footage would be very valuable. So if anyone has the wedding jam footage, it would be Mr. Johnstone.