Haydn - Te Deum in C Major (Maria Therese) 

It’s an over saturation thing. When I was at IU, there was world class music played every day of the week and hardly anyone in the audience except for the bigger works. This seems to be a conducting recital, so it wouldn’t attract the attention of many people except those close to the performers. As sad as it is, it’s just how it is at a massive music school like IU. So to answer your question, no they don’t know what they are missing.