What can I do with soaked beans that I can't use right away?
Cook the beans.

Cook them low and slow.  Cook them now, or tomorrow, during your engagement.  I routinely cook black beans 12 hours overnight.  The longer you cook them the sweeter they will be.  

Beans are one of those things that get better the day after.  Put the beans in the fridge after they are done and then you can eat them the day after tomorrow.   For breakfast!  Fry them in a pan and fry an egg in the middle of them.  That is what I ate for breakfast this morning (red beans, though).