It's the beginning of the school year in Australia and I am starting to prep for 2018 including my Classcraft games. It looks to me like the import random event button no longer appears on the random event settings page. I keep a dummy class with all my customisations in it and then import them through the year as needed. For those in a similar situation to this, it looks like it is now done through SETTINGS > IMPORT SETTINGS then select the class and which aspects you want to import. I went mildly crazy searching for a solution!