No! They are definitely not silly questions. You should never feel bad about asking for clarification. It's always better ask then get it wrong!
On my submission page I have this text:
The submission period of this jam has not ended yet. Rating opens Saturday at 1:59 AM. Others who have entered the jam will be able to rate your entry.
My understanding is: Up until Saturday at 1:59 AM anyone is allowed to submit a new game to the jam. After that time, no new submissions are allowed, but existing submissions can update their game page and files for up to 24 hours after Saturday at 1:59 AM.