Day of Event Sales Formula

Hoping to get help with my widget formula. I'm trying to calculate the total day of sales for all events in a season. My logic is to fsum the total ticket paid IF the order date is more than or equal to the event date. 

Days in Date = order_date

Days in Date1 = event_date

sum(
if(
[Days in Date]>= [Days in Date1],
[Total Ticket Paid Count],
0
)
)

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