There is almost an event for every event!!
Christmas= talking tree and turkey in shop, aswell as a visit by Santagotchi at about 10:00!!!!
Halloween= giant jacko-lanturn
Easter= a egg that hatches into a little black animal
New year= fireworks at midnight!
Your Birthday= celebration and cake in shop!!!
Valantines day= tama has love hearts on screen!!!
Febuary= tama enyoying the snowman!!!
Spring/Summer= flowers on screen!!!
Thats all i can remeber but i think there is more!!
Hope i helped, and have a super tama day!