Any tasks associated with an event / play can also be seen in the Event / Play window. From here you can add tasks and associate them with resources, so you can create all the tasks needed for a particular event / play. These can then be added to a project and billed.
Tasks are added on the left side. Once a task has been added, you can select the task and add the resource on the right side.
Click on the Calendar button in the window's top toolbar to view all tasks, performances, and/or volunteers associated with the event / play in a new calendar.