Limiting available spaces by day of week?

Since we can't show availability by time period on the calendar, is it possible to limit the number of spots available, by specific day? For example, I have three regular walking clients, plus about 3-5 that are every month, but random. These are all around the noon hour (11-1). One dog has a regular schedule. The other two will change their days during the week, depending on their work schedule. Is there a way to change the number of walks per day? For example, Mondays/Wed/Thurs 2 walks, Tues and Fri 3 walks?