I check the campaign website at: https://www.donaldjtrump.com/rallies/
Not sure if there are other places to check upcoming schedule.
This doesn’t give you the exact dates, but he’s got an ambitious schedule for the rest of this month. Going to CA and also to MI.
I suspect, when it gets close, he might do two and three a days.
Please check: https://en.wikipedia.org/wiki/List_of_post-election_Donald_Trump_rallies