Just saw Ed Byrnes show "Spoiler Alert" recently, and he mentioned being at a banking awards do where there was a "tombstone auction" before he went on. Basically tables of guests were chivvied into donating £10,000 a pop towards Save the Children (Princess Anne was there). There was no prize, and no real competition, just a total and individual contributions. After 8 minutes they ended up with a few million.
Anyway, Ed Byrne referred to the event as a "tombstone auction" which he hadn't heard of either. I've had a quick chat with Dr. Google, and they can't help either. Or rather they insist on telling me about "Tombstone Arizona". Which I know is a thing, but not what I was looking for.
So knowing there are linguists and pedants all over MN, I wondered if this is the clarion call you've been waiting for in lockdown.
Do you know what is being described ?