Edinburgh events are staged at the multiple award-winning Jazz Bar, 1a Chambers Street, Edinburgh EH1 1HR
These are on Wednesdays or Thursdays (but look out for exceptions!) 
There is no advance booking, just come in and pay cash (sorry, no cards) at the door.
All door cash goes to the musicians.
Gig times: Doors from 8pm, bands play two sets approx 8.45-10.55 then 10.25-11.30pm.

Glasgow events - SWING, 183 Hope Street, G2 2UL
(at West Regent Street)
These are normally on Tuesdays and Fridays (but look out for exceptions)
There is no advance booking, although tables may be pre-booked by contacting the venue. Just come in and pay cash (sorry, no cards) at the door. All door cash goes to the musicians.
Gig times: Doors open 7.30pm, bands play two sets approx 8-9 then 9.30-10.30pm.