It was clearly targeting the secular folks and the musicians, which are predominantly secular and from the opposition.

Ban on gatherings were introduced for short periods at the hight of the pandemic, the music ban was a separate one which lasted up until days ago.

All other kind of gatherings were allowed. They even held a large religious gathering , bringing people from all around the to the conversion of the Hagia Sophia museum into a mosque since it was also a political event(They were promising to turn it into a mosque since years, apparently an important thing for the devout muslims). This was between the first wave which claimed the lives of 50K and the 3rd wave which killed that many more.

That's why it's a ridiculous rule. It's arbitrary and subject to selective enforcement.

But as a guideline you could say if it's after midnight it's probably a party. And if it's not you let people use their judgment, because guidelines are suggestions enforced via social pressure, not via official penalties.

Still ridiculous.

If you forbid parties after midnight, people will party before midnight (have you been to London?).

If you forbid parties, people will still gather ("you're seriously calling our chess playing night a party?!").

If you want to forbid people gathering, forbid people gathering.