I think it really depends on which city you are in. In mine, Wed - Fri has always been the busiest for me as those are the days business men come by the truck load. Weekends are a bit hit or miss.
I've been rather lazy on my full force marketing ploy for the last month because I have been so, so busy elsewhere and it has kind of shown in the reduction of bookings, or at least the number of enquiries. So I had better pull my finger out and get back to it (but I am just so exhausted from chasing my kids around all day by the time I am child free - life eh?!).