“The first three nights of the conference there were different dinners I ‘had’ to attend after typical work hours, even though over eight hours had been spent doing work-related things at the conference already,” he explained.

“In my opinion, if I’ve spent 8 1/2 hours at a work conference with coworkers attending work-related sessions and giving a work-related presentation, past 5 o’clock, I am no longer ‘at work.’ I was already rather peeved that this was not the expectation at the start, but I was at least informed of these three different formal/scheduled dinners once the conference schedule was released.”

Source: https://www.buzzfeed.com/michaelabramwell/aita-not-attending-coworker-dinner-consequences