is there a schedule for these events, yoda especially?

Yoda and Palpatine have been alternating each month. You can expect Yoda about 2 months after whenever the last one was.

right gotcha

November events are here: https://forums.galaxy-of-heroes.starwars.ea.com/discussion/141612/event-calendar-nov#latest

As Liath said, they alternate so Yoda should be in December since Palpatine is this month

K November is almost over, can we get an update for December??