Ooh! Ooh! Suggestions! I loooove giving suggestions!

One Island Event - or rather several - I'd like to see are holidays! A pop-up window would appear giving the name of the holiday, and the villagers would engage in group activities.
The most obvious example of a group activity is the golden child's dance party. You know, when he/she goes to the center of the village and everyone dances? well, make it a pop-up worthy event and call it the Golden Child Festival, or something.
Here are some others:
Group siesta - everyone takes a break from working, sitting at the village center or in the garden - or both - and their action dialog says "siesta" - The pop-up would possibly call it a day of rest.
Religious Holidays - at regular intervals the villagers could gather at a designated spot like the idol, the boulder or the lagoon and dance - their action dialog would say something like "Celebrating Boulder Moving Day" - well, insert your own holiday, there.
Religious services - Everyone honors the idol
Memorial - Everyone honors the dead
Summer Time! - Everyone goes swimming (and maybe eats at the food bin)