I have some ideas.
emotion_kirakira _____________________________________________
Events♦ Best Friend Festival: A special party organized by the Host Club celebrating friendship and love! Have people bring their best friends for fun and games centered around team work.
Cosplays♦Genderbender Day: Hosts and guests get to dress as the opposite gender. (I want to see Shiny as a handsome man.)
♦Twin Day: Self explanatory. It could even be paired with Best Friend Festival.
4laugh Event/Cosplay♦Competitive Characters: This isn't a fully developed idea, fair warning. The idea is to stay in character as long as you can. To make it interesting and insanely more difficult, you will not pick your character. We 'put names into a hat' and let everyone participating 'draw a name'. Lets say Mai got CC, CC got Kyouya, and Kyouya got Mai for the sake of demonstration. Mai tells CC to be someone who is submissive and obedient, CC tells Kyouya to act like a slobbing commoner, Kyouya tells Maid to
shut up be a mute. Get a large group of characters together and just have them interact. The last one to stay in character wins! (Dress up is required.)
♦Monster Mash-querade: A Halloween ball! Come dressed as your favorite monster or creature.
♦First Thanksgiving: Native Americans and Pilgrims battle it out! Then we all come together for delicious food.