Lot's of all dayer events on these days e.g. Electric frog and Sub club soundsystem.
Not much else going on club wise on a Sunday (at least underground) other than the Sub club. Maybe Berkeley suite or La Cheeta. Cheesier places check Buff club, O2 Abc, The Garage, Bamboo
Pub wise -
Town - Max's (La Cheeta club is downstairs) any of the Soba's, Tabac, Mosqito, Chinaskis, Tiki bar, Stereo, Hummingbird, St Judes, Firewater, Liberté, Nice & Sleazy
Finnieston - Distill, Kelvingrove cafe, Rioja, Big slope, Lebowskis, Strip joint
West end - Soba, (Any of the bars in Ashton lane e.g. Vodka wodka, the lane, Grosvenor cafe, Ginty's) Oran Mor