Much the same happened to a group I was hosting years ago (before the current style of delivery services). We made a big sign, and hireda kid who worked in the hotal's** parking garage to picket the restaurant the following day from 11AM until 1PM. I don't know how well it worked, but the restaurant was mighty upset, even attempting to have the police remove the picketer. They wouldn't and were amused by our gall. We only missed newspaper coverage due to a gutless city deck.
** The hotel had no restaurant, only breakfast.