at fever pitch
In a state of great excitement, fervor, or agitation. The crowd's cheering was at fever pitch when the band finally appeared on stage. The warm-up speaker will have the crowd at fever pitch by the time you get on stage.
at ˈfever pitch
in a state of great excitement or great activity: The audience was at fever pitch. I’ve never seen such excitement at a concert.We’re working at fever pitch to get the hall ready for the concert at eight.