This is the Dallas Margarita Society happy hour event before the ball. If you are looking for a fun happy hour event or want to get a ticket for the ball then come out and check it out.
In order to get a ticket, look for and meet a DMS director (they will have pins on their jackets) and ask for one.
For those wanting to also do the YAP swing dancing event that evening you can do this happy hour early and then head into downtown afterwards easily from the tollway.
See their website for more details:
http://www.dallasmargaritasociety.org/defaultNextHpp.php