Use the time to learn more about the art of Kendo, possibly have a small seminar, will probably bring in a guest speaker.
Use the time to learn more about the shinai and learn some shinai maintenance: taking apart, putting back together, vocabulary terms, maintaining for long life.
Use the time to chill and hang out with kendo members, as there are alot of us, this could be a great time to finally get to know who exactly your training with.
Other: if you have a good suggestion email me and Ill see what we can do.