Quickbase Reminder Help

You can just set up a report where the start date is less than or equal to today and the end date is on her after today. That will give you a list of the records that are in  Active reminder condition.

Then set up a email Subscription  on that report to go to the correct people.

if in fact, the reminders are for different people and the reminders are assigned to a user, then you can make a report of my active reminders where the remind who field is the current user and send that subscription to a whole bunch of users. Each user will only get their own reminders on their version of the report received.