It's Sea n Vines this long weekend Sunday and Monday in McLaren Vale. http://www.mclarenvale.info/banksaseaandvines
If you haven't booked any tickets and fancy going, the normal wineries are still open for business and have their own events happening. Ekhidna Winery on Kangarilla Road, McLaren Vale has a band on. There is a new boutique winery called Mandelli's and they are putting on a band too.