Hi, my kids play at a baseball park with 5 fields with one of them being a nicer field for games. The nicer field also has a P.A. system and the US Flag in centerfield. Before games at the nicer field they play the National Anthem over the P.A. system while my kids team is practicing. What is proper etiquette? Can we continue our practice or because we can hear the Anthem should we stop practice and face the flag with hand over our hearts?