I work at Vanguard guys so.........
Friday nights are without a doubt where most of the adults attend. Of course there are little kids, but it's mainly adults.
Saturdays 10am-6pm is not a good time for you to go if you want to play with an older crowd. Saturday nights are very crowded but it is mostly with the adults.
Sunday from 12-4pm is a huge no-no. That is the time when we have our parties and all the kiddies come in. Sunday nights however it seems that they just all vanish. Like normal there are still some kids, but mostly honest adult/trustworthy players.
On another note. We are now placing Refs back into the field as often as we can. They are either playing or walking around and watching. So we are trying our best to crackdown on the "superman" players.