best way to depict up to 17 different entities in a calendar (week view)

I'm developing a week view of a calendar for scheduling 17 different venues (river boats as well as physical locations like banquet halls) for a client who specializes in providing venues for weddings, corporate events, etc.

Below is a rough prototype of the week view. I'm concerned about having 17 different colors representing each venue in the calendar. At first I thought having a color assigned to each venue would be an appropriate way to visually show how much an entity is used in a week. Will having up to 17 different colors be too loud? Is there a better way to depict visually how much a venue is used within a given week?

Thanks for your help.