We have multiple hosts running our nights and sometimes they swap round last-minute, or if someone's on holiday.
As a result, there isn't a specific telephone contact number for us.
However, all our hosts are part of our Telegram groups - UKOM General Chat group and our UKOM Late Notices group - so you can reach out on those or contact the hosts directly through there.
Additionally, we have an Updates Broadcast Channel where we keep performers aware of any important news (such as extended performance opportunities) or last-minute changes (such as an open mic being cancelled that evening) so please feel free to follow that so you don't miss out.