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I'm not sure the size of your chapter so this may or may not be feasible. We were also on a quarter system so it may need to change based on your school timeline.
What we did:
At the beginning of the term one or two seniors had their littles read a letter during chapter about their big. Some were funny but most were pretty heartfelt.

SAW week (senior appreciation)
Seniors choose the theme for chapter: all black, wacky costumes etc
Tuesday was Senior freshman day (there was also a junior sophomore event)
Wednesday was Senior Sophomore day (junior frosh event)
Thursday was junior senior night. My campus is also dry so this was held at a liveout and had a drinking theme. One year was the game of life so at the beginning we started with beers for college and a fake diploma. Eventually we worked our way through the game of life. The best part was at the "marriage" portion the seniors got ringpops while the juniors got huge sparkly bows on elastic to be a bow tie. Those still show up every so often.

Saturday starts with wills which is when we pass everything down from letters to awards to titles (heads of family, Barbie and Skipper, etc). We have a senior surprise after this which my year was a trip to the spa.

Sunday was the last day with senior ceremony where the seniors are given a gift (typically jewelry) and read letters to the chapter. They are also given baskets by their families/littles as a goodbye which is when we are given paddles.

It's a lot, but it is always pretty fun!