I've played one entirely unamplified acoustic 'skiffle' gig in the last 15 years.
A band consisting of stand up 'pub' piano, 2 acoustic guitars and singers
in a busy crowded L shaped art centre bar.

The room was packed with boozers, mostly standing in any available space between the few tables and bar.

The band was set up in the toe of the L where the piano was located,
no amps and speakers on order of the bar manager...

It was a completely futile waste of effort, time and money.

No one could hear us over the general bar noise and chatter
beyond the 2 or 3 tables immediately in front of us... 😣