Having been in such a club for nearly a decade, here's some further ideas to consider for the next year:
Halloween dance, - during this, show some sort of "horror" anime (the best responses we got were from Vampire Hunter D and Blood X), which is better if you have multiple rooms
Tanabata - A July celebration, we would do this at some point in June
Valentine's Day chocolate sale - Along with selling chocolates, explaining that the Japanese have the females give chocolates to the males, which return the favor on March 14
Tea Ceremony demonstration - if you know someone familiar with this tradition, awesome; if not, see if you can find a connection here
Japanese Garden - I'm not sure how close you live to Portland, but if it's feasible, this is an amazing experience; you might even want to consider doing volunteering work there
Kodomo ni Hi - Organize a trip to an elementary school or preschool and do something for Children's Day (We showed the old Big Bird Goes to Japan video and colored some carp kites)
Holiday celebration - Technically Christmas, but we also acknowledged Hanukkah (for me, mostly) and would have food, anime, and a white elephant event; we also did this type of thing at a member's house for a private club-members-only party
