My English friend Joe was the first person to give me the heads up about Cleaver's brilliant happy hour and when he recommends a bar, you listen. I was sceptical at first, the cocktail and slider special seemed to good to be true but I agreed to meet him after work one day for a drink or two (ended up being 7). You can't go wrong with any of the cocktails on the Menu and the sliders are delicious, especially the new Fish and Chip slider which tastes exactly like a fish burger from back home in Australia (and that's a hard taste to find in Calgary, I've spent 3 years finding fish that tastes even half as good). I've come down to Cleaver several other times since that initial evening and always enjoyed myself.
I also find that the atmosphere and vibe make it an ideal location for a first date, albeit only between the hours of 5-7 and 9 til close (I'm not made of money).
Always make sure you pre-book a table before heading down though, I barely ever see a free table at any time of the night.