It’s been year of transition, sometimes rocky, for Eventbrite—and it isn’t over yet.  After repeated delays in migrating key customers from Ticketfly, the concert ticketing platform Eventbrite acquired in 2017, Eventbrite set an October 1 deadline to move all clients over to its main website. But as of this week, there were still a handful of bigger customers that have yet to make the move. “As...