I have several calendars in my Google Calendar turned on for availability checks, but in some cases there's an event on one of them that I don't have to go to. If it's my own calendar, I can just mark that event as "Free" so that TidyCal offers that time anyway, but there are a couple of calendars I'm subscribed to that are managed by other organizations, so I have no access to edit those events. The only solution right now is to completely turn off that integration in the TidyCal settings, tell my client to book, wait for it to confirm, and then re-enable the integration. Aside from this being a pain, it can lead to issues if I forget to re-enable it.
It would be extremely helpful if we could create a one-time use link or add a one-time AVAILABLE date (not just the one-time UNAVAILABLE that we have now) in the availability settings that would override external calendars and make that one day/timeslot available.