The problem is getting people to take shifts. We had this at a restaurant I worked at in high school, but the only shifts that people would pick up were shifts

The problem is getting people to take shifts. We had this at a restaurant I worked at in high school, but the only shifts that people would pick up were shifts where the tips were good and those were generally on weekend nights. Not many audition times there. Most of the time, servers only got day time shifts picked up if they paid another server $25-$75. It was a little different for hourly workers. Generally those shifts were much easier to offload. On top of this, I doubt a restaurant manager really wants to deal with scheduling around auditions when there's really no upside. Its not like there is a labor shortage for serving jobs.