Event Request - block date(s) when event is full with a formula

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Hello! I am creating a form for people to sign-up for an event. There are only so many spots available for these events, so I want to have a date option be greyed/struck-out when the event is at capacity. Is there a formula or conditional formatting that will do this once the event is full? Thinking to use Sheet Summary to have a field where I key the maximum capacity and when that is reached, use that field as my criteria. Thoughts?

Thank you in advance!

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