Hmm, I don't think I'm doing this right, I don't see jack shit
Edit: found it, used map editor and looked around the maps to find any event tile of interest. Make sure to have started the quest to find the ticket before grabbing it (iirc it checks to make sure that switch is turned on before giving it to you), simply go back to the first floor, the left side of the hall has a fire extinguisher, interact with it to get the ticket.
Anyway, I found other events on the world map, one even gave you 50k gold, no idea how to activate it though, went to the tile and it did nothing
By the way, a different sex ticket is hidden here in the oasis: