I think I am trying to use a similar approach to what you did: How to add events in ghost cms
As you know, the logical solution would be to use the date of the event as the publish date. But since that’s not possible with Ghost right now, I had to put the event date into another field. Before settling on Code Injection Footer, as I believe you did, I had also tried the Excerpt and the Featured Image Alt attribute fields.
Now I realize I’ve seen several of your blog posts, but did you ever get the chance to post about how you ended up handling events?