The 2020 FRC challenge is:
Alliances of three robots are going into FIRST City to complete the mission
You can watch the game reveal here: FIRST Robotics Competition INFINITE RECHARGE ...
The 2019 OCCRA challenge is:
Roll the Dice. Matches are played on a Field set up as illustrated in the figures and described throughout. Two Alliances - one “red” and one “blue” - composed of two (2) Drive Teams and Robots each, compete in each Match. The object of the game is to attain more Match Points than the opposing Alliance by scoring Dice in various ways.