Looking at the schedule of the upcoming events (for the few things we know), limited to the women:
PD 14 - Day 21 - Saturday
- 1 Ellie event, probably another shower in the morning but that's just speculation
PD 15 - Day 22 - Sunday
[1st lesbian sex scene with an important character: Within the next 3 playable days]
- ranch event, probably all day long with Patricia
PD 16 - Day 23 - Monday
[
2nd lesbian sex scene with an important character: Within the next 4 playable days]
- there are "several Ellie's events spread out over the day" (aka Ellie's day) and the return of Julia (?)
PD 17 - Day 24 - Tuesday
[3rd big lesbian sex(ual) scene with an important character: Within the next 5 playable days]
- 2 Ellie's events
- Alyssa will be back and they are likely to meet at soccer practice ("I think Tuesday next week when our boys have soccer practice will be the earliest we can see each other again.")
Ellie could get very close in the next event, but I guess everybody is betting on Patricia and the ranch event for the first lesbian event.
Ellie (and/or Julia) could be the second one(s) on Monday followed by Alyssa the next day.
Obviously and as usual, everything with grain of salt because we basically know squat about all the remaining events in the middle (e.g. we don't know when Nathalie will be back).