Few Explorer 5 Night Cruise Questions

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I Have Never Been On A 5 Night Cruise And Know There Is 1 Formal Night, How Many Semi-formal Nights Are There?

And Also, We Are Booking Our Own Flights, As We Have Soooo Many Miles, So We Need To Use. Right Now They Are Only Showing A 3:15pm Arrival Into Miami And That Cuts It Close In My Opinion To The 5:00pm Sailing. Typically They Add More Flights As Time Get Closer, Isn't This So? Our Cruise Is Not Until May 7th, So It Might Be Best To Wait It Out A Bit Before Booking Flights, Do You Think? Thanks!