A quick note to say that at our local repair cafe we do a roaring trade in vacuum repairs for peanuts (not literal peanuts; though some of our repairers do get peckish). If you're in Europe, there's chance you have one nearby. https://repaircafe.org/en
Could you please go in to a bit more detail on how you set that up, how you handle issues, etc? I'm a member of a makerspace, and there's been discussions about doing something similar. There's just not a consensus about how to go about it.
...generally I've seen weekly/monthly "fix-it" workshops as a kindof open-house / membership drive.
Probably best to 1) have people sign safety waivers, especially if they're not members 2) have people sign a "we can offer to help you try, but your widget might end up worse than before" waiver 3) run it as a volunteer outreach event with a focus on getting membership rather than a transactional "fix my ____ for free" outcome