My aunt and uncle were in town for my graduation and got into town looking for something to do so we went to Spiked at DBG. (http://www.dbg.org/index.php/plan/calendar/spikedspring)
The event was a cool setup you pay to get in $25 a person. Then you get all you can eat food and you can tour the gardens at night. They have alcohol at the event and it is pay per drink. The prices weren't too bad pretty typical drink prices for being out.
The gardens at night offer a different experience then the daytime there are several cactus flowers that bloom at night. Plus as the temperature rises it's nice to have events in the evening.