It's a fun, themed holiday for pubs in Edmonton. Pubs will have bag pipes and Celtic music. This is usually ironically, but I actually kind of like it. Guinness is served with great gusto, which I have no problems with. And drink specials are good. Plus, the pub I go to frequently has a really good "Irish stew" on St. Patrick's Day, and a couple of contests.
Pubs open early (10 or 11 am), and people drink.
But I could do without the tacky green accessories, the girls dressed in slutty green, and people pretending to be Irish. Do wear green clothes, but there's no need for the plastic chains, and massive, tacky, cloverleaf sunglasses.