My question involves a traffic ticket from the state of: Washington (Spokane)

I have a court date set for June 28th on a contested speeding ticket. I just found this forum yesterday and have been feverishly reading everything I can. I did not request discovery in time. How would I go about requesting a continuance so that I can request discovery? I originally contested it just to ask for a deferral or a reduced fine/citation, which from reading seems like I would do with the prosecutor on the day of the hearing. Any help or pointing in the right direction would be appreciated.