Like others, I would be tempted to play my own music loudly,
but of course this will inconvenience your other neighbours.
I assume you do have other neighbours.
Are the by-laws in your area of any help? I would check this with Citizens' advice or the police.
As your neighbours have formerly made themselves unpleasant when you tried to discuss a matter with them, I fully understand why you don't want to approach them this time, but there is precious little else you can do.
Loud music all week-end is not something you should have to put up with, so find out whether you legally can stop this, or have other neighbours affected by it too.