Amber,
Thanks for getting in touch! Unfortunately if there’s no repeatable pattern to the event (i.e. – Every x days), then your best bet will be to create three separate instances of the event. And regarding your question about TimeZones, you could create an Additional Field called ‘Time Zone’ that will display on the event for your users. If you’re unsure how to do this, take a look at our tutorial on adding Additional fields here: https://theeventscalendar.com/support/documentation/events-calendar-pro-new-user-primer/#custom
Hopefully that helps get you pointed in the right direction, but let me know if you have further questions. Thanks! 🙂
-Casey-