I can’t begin to tell you WHY this is the case, but after some tweaking and removing it from the sub-menu of Calendar, it seems the Submit an Event page works again!
I know, but I’m not questioning it. Gift horse, and all. If it stops working again, please feel free to let me know. Meanwhile, go forth! Use it! Advertise your gigs and get more audience members! Let’s DO this!
–your friendly neighborhood SoCal CASA Ambassador