At 00:55 there is an interruption to the music both in the Ballroom and on the roof
Zou Yan:
"A reminder to those staying at the LAC complex hotels, that the Portal to the complex will be closing in 20 minutes at one fifteen. Those wishing to return to their hotels should ensure they transit the portal by this time."
The Ball will wind down at this point - it's generally scheduled to end at this point, and anybody who was likely to join the party on the roof would have done so by this point.
At 01:55 there is a second interruption to the music on the roof
Zou Yan:
"A reminder to those wishing to make use of the transport to return to the towns. The last buses will leave promptly at zero two thirty, that's in half an hour ladies and gentlemen. If you don't wish a long walk home then make sure you get on the buses!"
At about 01:30 those of you not too drunk to notice, will notice an incident between Charlie, the brunette Rhiannon saw Cassandra dancing with, Cassandra, and peripherally Kenneth, mainly on the ground that Kenneth and the girl are moving to leave the party together. Charlie stops what she's doing at that point and makes a deliberate beeline for the pair. Cassandra, who's talking, and has been for a while to a girl of Caucasian descent, will react and rapidly follow. It's a little difficult to 'read' the situation, but it would appear that perhaps Charlie was trying to stop the girl leaving with Kenneth, but Cassandra's intervention, and she appear to question Kenneth, causes Charlie to back-down, and the girl and Kenneth leave together. Charlie and Cassandra then return to their respective partners/activities.
For the most part the 'Roof Top' party will wind down about 02:15. Charlie and all her friends with their partners will retire to their rooms at this point. Blake would have left around 1am, Winter, and Natalie, shortly after, and Natsuki around 01:25. Cassandra leaves shortly after 2am, whilst Edward doesn't leave until the party winds down.
Anybody, wishing to find a casual partner for the night can do so, setting aside your PA's for whom its one of their functions (there has already been a previous discussion ref the fact they're all professional escorts). For the ladies you generally have the choice of one of the younger male You-Tubers (as most of them are unattached), one of the younger gentlemen in Georgian dress (generally one of the few at the roof party), or one of those from the 'modern' town (again generally one of those at the roof party). For the gentlemen you're generally restricted to the younger women from the modern town, unless you picked up one of the younger ladies in Georgian dress in the Ballroom.
The distribution of ethnicity of those from the modern town at the ball is roughly 33% Caucasian (generically white American), 33% Asian (typically Chinese for all intents and purposes), and 33% Hispanic (Mexican/Brazilian/Cuban). Pretty much all of these have grown up here. If they don't themselves work for Mizzurian, then for about 40% of them at least one of their parents does. For the rest some will own and run their own business, some work in the family business, some work for other businesses organizations in town, and a number are waiting to go to University either in the Nisenan Valley Republic, Roanoke, or somewhere else on 'Yellowstone' (it's not too difficult to work out that by 'Yellowstone' they mean Yellowstone Earth or what Cordelia calls True Earth).
Most of them will have visited 'Yellowstone' a few times, and possibly also 'Mizzurian' (Mizzurian Earth). Those who are older and possibly have visited both will remark on how different they are, especially how different 'Sacramento' and the whole surrounding areas are. Other than those going to a University on 'Yellowstone' none will have been outside the Northern Part of California (nominally the Nisenan Valley Republic on Yellowstone Earth), and most of those will have generally been winter skiing in either Heavenly, Kirkwood, or Sierra-at-Tahoe.