Final answer:
The sign on the Ramirez Dance Studio was a red bandana sticking out of Maybelle's front pocket instead of tied around her neck.
Step-by-step explanation:
The sign on the Ramirez Dance Studio was a red bandana sticking out of Maybelle's front pocket instead of tied around her neck. This signified that the police were coming or already present. The dancers would quickly switch partners and form male/female couples before the police appeared in the doorway.