A little background: my venue offers the option to have guests pay per car for valet or for us to prepay it. Obviously we are prepaying for their valet parking. Here's my dilemma, there will be another event in a different room/same parking lot and I'm concerned that if the other party doesn't pay for their guests parking, my guests may assume without asking that they would have to pay and try to park somewhere else. Should I put that the valet parking is covered with the information about the venue?