Answer:
No hable durante el concierto, por favor.
Step-by-step explanation:
The term "Negative Ud." stands for "Negative Usted". It happens by putting a negative word (No) in front of a verb in the negative usted command. So "No Hable" is pretty much "Don't speak". Then we follow with "durante el concierto" (during the concert), and "por favor" which is "please".