After updating to 10.0.3, I still see 170 items listed in the "Upcoming Events" list. System Updates says that the update to 10.0.3 has completed. Will these items remain in Upcoming Events forever, is there a way to remove them and should I do so?

They all list the time as Undefined except for 3 Knowledge Base Files items. These list a time a few minutes from now and keep advanced the clock without completing.