There is a lot of conflicting information as to what exactly happened on 4-21-95. Up until this point, Elliott had been on tour with Mary Lou Lord and also the two of them joined Guided By Voices for some shows. The screenshot of tour dates pictured below shows that Elliott was scheduled to play with Guided By Voices and Mary Lou Lord at Spaceland in Los Angeles, CA this night. The Guided By Voices database linked below also mentions Elliott and Mary Lou Lord as the openers for that Spaceland show.
However, the flyer below was posted by the Instagram account "olympiaflyers". It shows Heatmiser playing on this same date, based on the day date combination of Friday and April 21. Furthermore, there is an ad from The Rocket showing Heatmiser playing the following night (4-22) in Seattle. And the Guided By Voices database mentions Elliott apparently being scheduled but not actually playing at the 4-22 San Diego GBV show. See here:
So I don't really know which show Elliott played at and no one I've contacted that might have been there can remember/verify. Especially due to the evidence of Elliott not playing in SD on 4-22 and Heatmiser looking to have played in Seattle on 4-22, I'm guessing that Elliott left the GBV/MLL tour a few shows before it ended and played with Heatmiser this day in Olympia. If anyone has any more definitive information, please let me know.