Block Party

This is the sign.  This sign is posted at all four corners of on the the busiest intersections in my town.  It's also at random locations down the main street (not Main Street, but the main street) that runs by all the fast food places, the grocery etc...
What kind of a town do I live in?  It's a nice little place.  Some would call it small town.  It has its share of good and bad; it's a pretty 'normal' place to live.
But the town over...in the next county, mind you...they are having a block party.  And they want the world to come.  In case you can't read the sign...what you have to look forward to at this block party:
"LIVE MUSIC  *  BEER  *  CORNHOLE  *  GAMBLING  *  BEER PONG  *  FLIPCUP"

? Is it legal to gamble at a block party?  Should you really advertise it?
I'm not going because I'm not real sure I know what the dress code would be for such an event.