In version 5.0, you can enter information about upcoming ComicCons and conventions (as well as past ones, I suppose, but, God knows why you would <g>).
This window looks and works a lot like the Contacts/Source window (not much of a surprise really since I copied it from that window).
As of version 5.0.6, you can enter data, but Realms hasn't been enhanced yet to notify you of upcoming ComicCons. That will be a future (near future, at that) enhancement.
While in Realms, turn on the Cue Cards, and move the mouse over any caption to get more information about that field.