Is there a lot of vendors during the week?

Yes it is

Tue Wed and Fri there are a good amount. From about 10 until 12:30-1:00 the venders are just about done setting up around 10 if you try to be an early bird you will miss a lot of them

On the weekends yes

I would say about 1/2 the amount compared to full like on the weekends & especially Wednesdays (one of th busiest days - especially for used items).. weekends are a lot of new items, which I am not usually interested in.

Yes, there are specially on Wednesdays