You can still submit!
The online submission facility for the Electoral Finance Bill is still working and the good people in the Office of the Clerk traditionally will still process submissions that come in over a weekend, if there was a Friday deadline.
Go to this post for details of how to make your submission, and some issues you can mention in your submission. Go ahead and do it – you’ll feel better for it. And ask to be heard by the Select Committee, unless that would freak you out. The Select Committee can travel about so don’t worry if you live outside Wellington.