So we are running out of time before we will get help
Solutions could be:
1. Credit the guild reward to everyone (while the event is still running, to make sure that those that hemmed their way through the event will get the event wrapper)
2. Go back to the code when guild jumping to help was possible - than all drops would count again. You could change it back for the next event
3. Do nothing and hope that more player gem to get the guild reward (don't believe that this will happen)
I really hope that you will come up with 1 or 2 (or maybe 4) but not with 3...