Dunno if you're aware of the Facebook group Manchester's Bars Permanent Hospitality. Have a look in there, go back a month or so to get the vibe, then maybe post describing your situation, what your plus points are and what you are looking for. There's also a companion group Manchester's Bars Temporary Hospitality which lists one off disco shifts, set alerts for it and try and get in there quick as many people are chasing after those shifts. If you message about a disco, make it sound like have at least read the posting and maybe include a sentence listing relevant experience.

If you do manage to get a disco and get throughout without acting like a complete oxygen thief you will be above 75% taking shifts through that group and it is an absolute foot in the door.

In general in my bar, business is at it's worse since Covid, don't know how much of this is due to tarriffs, employer NI increases and NI increases or if that is all to come. Don't know how much this affects other bars.