No, you can get the location of the main missions only through interacting with Momonga's token. Orange names are side events only. Charges can actually be recharged if you discover the door to another world (and if you discover it when you do not need it, simply leave it alone and save it up for when you do.)
At this point, I am fairly sure if the Sorcerer Kingdom is orange, you are missing an event... If you open up the sorcerer kingdom, where does the pin point? Should be either E-Rantel or Carne Village. Gazef (if he exists) needs Brain Event in the lizardmen lake as well.
If you have completed the game and you are missing more than half of the gallery, then yes, you have skipped quite many side events.