On June 13, a new event calendar system will be launched. At that date, only events in the new system will be displayed. Please make sure all events after June 13 are added to https://content.uiowa.edu. You can find out more information about the transition on that site as well.
Oliva Smith gave a very comprehensive review of NCBI MyBibliography. In particular, I found the information about glitches in the system and how to circumvent them useful – they will certainly save participants time.