Jeezy peeps, are you being intentionally obtuse?
All this squirming to say that it wasn't a party, Johnson wasn't there, it wasn't really illegal, it didn't make any difference...
If you have to make so many excuses, can you not just give in and agree that it was a bad idea? Even if Johnson wasn't there and knew nothing about it, if he had any cajones he would have come on TV the day after he found out about it and said that a group of this staff (or whatever) had had a party in contravention of the rules and he'd sacked them because he understood how important it was for people to see that the centre of government was unimpeachable.
That's not going to happen, is it?