Before I start, I’d like to say the rollercoaster during each event should change, to give us a reason to go on it through out the year. (Also, I’d like to suggest, perhaps a minigame on the rollercoaster? Like shooting targets?)
Easter Egg Hunt
Easter themed items
Ability to Open eggs for random prizes
Possible Easter bunny outfit
Easter bunny roams around the tower, and maybe you get something to do from him? Also maybe a gift is given to you?
Easter Basket to put your eggs in
Different Rarity Eggs
After collecting enough eggs, the easter bunny can reward you with a trophy to display in your condo (Achievement)
A christmas tree
Christmas themed items
Presents are unlocked everyday under the tree, and you get something random just for logging on during December
Santa / someone impersonating santa roams around the tower, giving gifts to the good boys and girls
During december, if you give maybe, 10 gifts you get a rewards, 30 gifts, a better reward 50 gifts amazing reward etc.
Trophy given from santa to display in your condo for giving a certain amount of gifts (Achievement)
Ghosts roam around the tower
Possibility to become a ghost
Possess items, and make them move around the tower
Some sort of halloween minigame?
Halloween themed items
Trophy to display in your condo for completing the Halloween themed event task or something? (Achievement)
A trophy case, please. It really would be nice to display your trophies, instead of trying to make a trophy case your self.
EDIT: Some more ideas!
Possibility that the costumes have different abilities, just passive abilities, nothing that will really mess with people.
Everything in the tower is changed to a different colour (Pink and purple, perhaps?)
a Change log in the tower with a change saying “Jackpots on the Slots are now the most common payout, so get spending!”
Pretend all of the Tower Unite data got deleted, and everyone joins with 0 units. This is only a temporary thing, because as soon as you walk out the train station, everything is back.
Have a voice shouting as soon as you join the server: “Tactical Nuke in Bound”
a notice when you join: Lobby 3 is now officially released!. Maybe have a certain part of the tower just… Gone?