I just tried publishing a test event to only the Damus relay and it worked for me.
https://troop.is/events/naddr1qqjrqse3gfz52sfe94zrvdjx956yzdfc94prxvpe94ryzses8yuryvesgsur2qgkwaehxw309aex2mrp0yh8qunfd4skctnwv46qyg9g7dep4z0ak7d8ulrw0wqnf3eq5sytdsjt7snzgxw02jckp3f85cpsgqqq0jes2u8wyr