So, I knew I needed to come up with a plan for the summer that allowed for screens and relaxation, without going overboard, but also allowed for me to work. Sending them to camp for any length of time is not financially feasible, and since I am at home, we don't need paid childcare, it seemed the most reasonable thing to do was to turn the house into a mini-summer camp for them.
The main take-away I had from perusing preschool calendars and summer camp schedules is themes. Either by day or by week, there are activities that are specific to certain days. Rather than just being open-ended, the days are structured in a way that gives some direction to what they should be doing today and what they can look forward to tomorrow.
The flip side of that is knowing that (a) I am not a camp director and do not want to be needed for entertainment all day long (they should be able to occupy themselves for the most part), and (b) I'm not that good at setting up and taking down activities and I don't like big messes that have to be cleaned up. So I had to find a middle ground of sorts.
I spent some time coming up with a weekly schedule that incorporated screen time under clear limits along with some new and different but self-directed activities. Then I played around in Excel to make this calendar: