i dont think so that others can get it early access.
Purple night will be another meeting (first bussinsss class) with Chris. It's too soon for her to fuck with everyone.
Although of course I agree that it's a different location. It may be that he actually gets a text message about a late business meeting

on Monday late-evening (or tuesday), although some unexpected event may occur during it.
If I had to write it out in a script:
late in the evening Viv receives a text message from Chris about an urgent business meeting.
" - get ready, I'm sending a car for you, urgent business meeting"
she quickly puts on a purple dress (or gets it from the driver a moment before the meeting - it has some symbolic meaning) and drives to a new location. The meeting there ends quite quickly, Chris fucks her - so that maybe someone will join (but as a viewer), and then Vivian falls asleep (with CHris). In the morning she wakes up but instead of Chris there is a note - "I had to get up early, I didn't wake you up. Someone will take you home."
That someone is a basketboy, she says to the driver while she's still in front of the house - "please don't tell anyone"
hence we have this hard look in the sports hall