The rally occurred on Century Boulevard.
The union overwhelmingly authorized a strike earlier this month, and could begin the work stoppage at dozens of hotels as early as the July 4th weekend.
The workers are concerned about the rising cost of housing, many commuting hours to get to work because they can't afford to live in the area.
he union is seeking to create a hospitality workforce housing fund, in addition to better wages, healthcare benefits, pension and safer workloads.