Well for 121, just about every day is the same. You are schedule so not many changes, not including IROP. For 135 that is a different, gets busiest probably day before Thanksgiving. Workload goes up 4 times. I once had to work 40 International flights during my shift and most were due within the first 5 hours of my shift.
Dispatch doesn't have a superbowl. There are so many factors that go into an operations day that it is impossible to quantify. I've worked the busiest travel day of the year (Sunday after Thanksgiving?) and we ran a 100% on-time-zero day where I was bored out of my skull. I've worked the lightest travel day of the year (Thanksgiving) and been slammed (a communications line into the airport was cut, and I and a fellow dispatcher had to jump on a plane to PHL to do manual dispatching from the Ops Office...good times good times!