@Becca_Hayes
Currently I am on mobile so when I will try it on my PC, I will give you the expression. For the current moment,
I will suggest to use a scheduled trigger, that would run everyday once.
You can make a new flow in the starting search for schedule. Then set the schedule to run everyday.
After this use get items, and in the filter use
StartDate eq utcNow('MM-dd-yyyy')
Here the formats of both start date and and utc now should match like whatever is stored in your SP list.
Then you can update to occuring.
By this your flow will run everyday, get items will filter out records where start date matches current date and then update the status to occuring.
If you got all of this try yourself, if you didn't just reply and I will post screenshots. 🙂