Make sure you have enough time before to setup the room and enough time after to breakdown the room. Venues may book more than one event in the same room on the same date for different times. Some events are  scheduled too close to get into the room before you will have to rush to get the room organized the way you want it. this creates stress on everyone involved. Also you don't want to have to cut you meeting short because there is a group of people waiting to get in immediately after you are scheduled to be done. This also creates stress and can leave a bad memory on the event.