If you can't find your schedule over there, say there are courses or other activities (saying there are other activities in the class is very effective). In short, you can be vague when you answer. For example, I will try to inform everyone to attend, but there may be many people who have no time or other things that can't go to the same category, and then tell the students about it. Just give them the notice in place and let them choose whether to go or not. . . . In fact, they can't count the people who go. You are from the class committee, not the student union. You work for the welfare of the class, not to complete the boring tasks assigned by the student union, and you don't have to be afraid to look at their faces. But it's not easy to make enemies after all. I think this is more reasonable.
If it's forced there, there's nothing we can do. If the students have any opinions, explain them clearly. After the activity, we can report this problem to the school or the event organizer (although most of them will not improve. . . ), but you can still have a try.
In addition, this kind of thing basically happens to freshmen, and it will be better in senior year. . . It's time to pull a new student. In short, it's basically bullying freshmen = = (what an asshole)
Although the university is relatively simple, it is also a helpless place, especially when it is a class Committee. . . . Hey, but that's how people grow up. I wish you success ~