Speaking as one who has all the required shots posted, I say go ahead and extend it. It seems that some where caught off guard, especially since the event actually didn't start until way after the beginning date. I mean, I just happened to have a roll already shot and processed even before the rules were finalized, but it fell within the dates of the contest. I then had to teardown my camera, repair it, and shoot two more rolls to get the full complement of entries. But I was lucky. I don't work anymore, so I had plenty of time to do all this, but most everyone else have busy lives. I'm sure someone can come up with an important Soviet event to celebrate on June 30th in order to properly close the competition.
PF