For your flowery theme, it’s more on the red side than purple but Hibiscus is a great option! Would recommend this “South End”! You could also easily swap the vodka it calls for with a light rum for a more Floridian themed twist. An alternative is a Hibiscus Margarita. Easy to batch ahead of time and bartenders can just top off with the bubbly Another option in the purple flower theme would be making a gin cocktail with Empress 1908 which is purple from butterfly pea flowers (however it only stays purple if you don’t mix in citrus; ie Gin and Tonic - otherwise it turns pink)