What I'm thinking-

Kind of like the easter egg exchange, a player1 pays so many gralats in exchange for getting to enter another player2's house. The player2 has categorized this payable event as a play, fashion show, etc. Then the player1 gets to rate their event out of so many stars, so later players will know if player2 is actually hosting events or just getting gralats.

Of course, there's the possibility of player2 getting their friends to rate their house maximum stars, but there could also be ways for players to leave comments under player2's house events such as; "scam!" so that when they see comments like; "best house ever 10/10" as well then they might know that something's up

This could also work for paying for food items, as players could rate player2's liability out of so many stars and write comments to warn others or let them know that they don't scam