PD16 is known as Ellie day, since it's the day with the most Ellie events - "several", going by the roadmap L&P gave us 3-odd years ago. Also happens to be the day the Ellie route branches into three, and the day of the "wild" event. I had thought the "wild" event was going to be Sophia/Ellie until
Old Dog asked L&P if it was a hetero event or not, which it appears to be.
How many is "several", we'll probably only know when the event list for PD16 comes out. But from memory the most amount of events Ellie has on any other day is 2, so "several" could be as little as 3, which is a bit of a disgrace since it's less than half of the Dylan events for PD13, and we don't even know of there is a day he doesn't have more. On his roadmap we're only told if he has events on a particular day or not, so in the future it's entirely possible to have a day with more Dylan events than Sophia