Ged Barry writes on Facebook:

"starts  7.30pm until 9.30pm. It's upstairs at The Ship and Mitre, 133 Dale St, Liverpool L2 2JH. Musicians' names who are attending go into a hat and are pulled out and organised into duos and trios, quartets. All musicians from any musical genres and instruments welcome. Hope to see you there! Ged"

Editors comment: It is understood that this event happens on the third Tuesday of the Month, but not every third Tuesday. The listings the iNtworks Mersesyside calendar may help.
Check before attending.