22H Event match 7H Solo Event?
Would it be possible that the 7H Solo Events rotate to the related event when the new 22H Event starts?
ie 22H Event Arena Wins finishes and goes to 22H Level Up, 7H Solo Event Science Arena Battle finishes then goes to a random 7H Class Advancement, followed by a random 7H Class Advancement, etc until the next 22H Event starts, ie. 22H Hero Usage, so the next 7H Solo Event would be 7H Class Combat and rotate 7H Class Combat until the next 22H Event starts...
That would give some predictability but also some variability and encourage play and coordinated usage of resources.