If one is having a party or gig they must tell people personally who will attend, otherwise showing up is prohibited and the called upon person must therefore not attend.
Kelvin: Going to TOTT for new damage ep launch?
Tom: meh, i was never told by gilly himself, therefore i shall not show, Rule #67
If you're offered a drink, you must accept the drink unless said giver has a criminal record
Bartender: Could I offer you boys some vodka?
Guy 1: Sure, I could use a drink
Guy 2: *Dude, rule 136, he murdered the last guy that had sex with his ex*
Guy 1: *shit*