Hello campbellsvilletourism,
The plugin isn’t designed to handle non-regular recurrences. You could start with something like a weekly recurrence for Sat at 2:30 and then edit the days that don’t conform to that schedule. However doing so breaks their link to the other days.
Also, did you try the custom recurrence option?
I’m sorry that it’s not able to easily do what you’d like. This is something that is on our radar, but we don’t have a schedule defined for it yet. If you feel you’d want a refund, please email pro (at) tri.be and reference this thread and they can help you there.
— Julie