Hire a coordinator to do all the work. Tell them to establish a budget and pay the coordinator before the party.

Tell them to eff-off or pay a rental fee for using your home as a rental entertainment venue. Charge professional prices as well and force em to sign a contract of liability for all things party related. If they refuse, tell them to leave or threaten to call police for trespassing. Your home, your rules.

Only if you are a pushover and do it! It will probably take all your powers of self control but just sit there with a glass of wine and do nothing. Or just leave, go and run some errands and get back about an hour before the guests arrive. If you are worried you will look lazy then a pointed "let me know if there is anything I can do to help you" works wonders.

My guess is: Your in-laws. Your in-laws will do all the work since you will have checked into a hotel far away to avoid the toxic hellstew of Covid and criticism.

OP, just say no. No to having your home become a hub for infectious disease spreading. No to the unabashed gall of showing up and deciding to use your home for a party. And if your spouse won’t back you up on this then you have a bigger problem than his stupid parents.

um...so tell them no. It's not that difficult. You say, "No you may not throw a party at my house. Do it at yours."

Your in-laws or your spouse.

"Just Say No" to entitled in-laws.