In both of your examples you would use "está".
El colegio está en Reno.
La clase está en el colegio. (Maybe, "El aula está en el colegio" o "El salón de curso está en el colegio".
"El concierto es en el estadio". The concert is [happening] at the stadium.
Normally you have football or soccer games at the stadium, but "The Boss is playing at the stadium", so you would say "El concierto de Bruce S. es [se llevará a cabo] en el estadio".
Does that help?
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