I'm sure there's a better way to do it but here's something that I put together based on something I already had.
Delete the blank summary tab you have, insert in Column A on each tab a column for "Event", then run this and delete anything that's already closed which should sort to the top and you'll be left with a list sorted by "Event" then by "Due Date".
One problem that I came across that maybe someone else can help with is how to get the range to be a dynamic selection so in the event that you go passed a certain number of lines it will still pick it up. I'm sure there's also a way to get it to delete anything that has data in the date closed column for you but this is hopefully a start that get's you moving in the right direction.
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