I'm a university student.
I'd love if it was easier to always have all of my lunches/dinners booked, either with business related meetings or meals with friends.
Potential solution: Click on a friends name, see their location (where they live on campus), and the meals they have free. Click one to add to both of our calendars (already authed to gcal). If you knew class schedule of users, could also optimize locations based on where individuals will be at given times (i.e. lunch with Chris on west campus is perfect for them on Thursdays, because they have a class on west campus at 12.50pm).
Disclaimer: This isn't a startup, it's a feature.