Check out the NL tourism website. It has lots of information on which towns have festivals. I posted the link below for you. Check out Water Street. There are some traditional Irish pubs there as well. I believe that Shamrock City, and O'Reilly are down there. Its within walking distance from George Street. During the day, Water street also has lots of small shops and small restaurants. Mom and Pop types of places. While there you may try Yellow Belly Brewery, it's also on Water Street.
While on this side of the island take a side trip to Quidi Vidi (pronounced kiddy viddy), its laid out very similarly to a traditional NL fishing village. There is also the icebrg brewery down there. You can get beer made from melted iceberg water.
TourismDan
BTW-i live here on the east side of the island.