i went to teachers’ weddings as students for chuppah. one teacher in HS we went for second dance; other grades she taught came for other parts. she told us after in class thanks so much for coming-it gave me a break from dancing with all the older ladies (not her exact words but along those lines)
I think its very sweet when the students come for kabalas panim and/or chuppah. it gets annoying when some of them are there during the dancing and dont know what to do with themselves