3 things are obviously needed. Two are not capable of rational opposition. One is more difficult.
A total exemption for unamplified music (leaving non-licensing controls in place), at least in licensed premises, is in my view essential.
Likewise an exemption for not more than 30 performers of dance who perform to unamplified live music is very desirable.
Some sort of "small scale" exemption is probably desirable but because the existing law of noise control is not properly enforced it is very difficult to draft something that does not cause problems. Perhaps places planning small scale performance should be able to notify the local authority and to hold the event as of right - unless they get caught breaking any other law such as (principally) noise law - since the LA has a statutory duty to monitor under the Environmental Protection Act.