I hope you will keep playing whatever form that takes. Here are a few ideas:
Play with other people regularly: You may have to take the lead and organize it.
Work through book 2 again, in order to be ready for Book 3
Review the Class Blogs. You will have access to them through the summer.
Go to BUG Jams. BUG takes a break after June but there is usually a Tuesday evening jam at the Village Green in good weather.
Check out The Ukulele Way. This is James Hill's Online Video lesson program.
Especially…. play music, have fun.