If, by "formal", you mean establishing a strict schedule for sailing, jacuzzi, strip club while also making sure there is enough stock to not run out of rum for the evening, then yes, a-catters are quite formal.
Now hold on there partner... I thought Mr. Moss was the only deviant in that clan. The one and only A-cat gathering I attend... well kinda crashed, there was no rum and the question was would you prefer a gin or vodka martini (gin is superior btw) it was all quite civilized. There was no mention of strip clubs, I really must learn the secret handshake.
