Have you set the dates correctly? I think but I am not sure, that the submission phase will not come on until the date that is set.
The bulb icon is used to switch the workshop into the other phase - consistently with using the icon at the course page where it is used to set the current topic.
What you probably want is to open the workshop for submitting - that is to switch it to the submission phase. To do so, click the bulb icon below the "Submission phase" headline in the second column of the planner tool.