If you're after a great pub or bar, try the Lobethal Bierhaus. Great food & boutique beers. It's about 35 minutes from the CBD. You'll need a car to get there, and it's a nice drive into the hills. You could also duck in to the Lobethal oval and watch the Hills Footy League grand finals (my son is playing).
Other than footy finals, I think it's going to be a reasonably quiet weekend in Adelaide. And a bit iffy with the weather. There is the OzAsia Festival. Starts Friday and runs for a couple of weeks. The museum and art gallery are good. The Bradman Collection is great if you're a cricket nut. The Royal Adelaide Show is on - finishes Saturday night. Good city pubs are dotted around here & there. And good restaurants, like the Jasmine Indian restaurant in Hindmarsh Square. Best Indian in SA.
Have fun.