May/June twice a week x 3 weeks (May 18-June 3)
May/June once a week x 6 weeks (May 17 - June 25)
June/July twice a week x 3 weeks (June 29 - July 15)
June/July once a week x 6 weeks (June 28 - Aug 6)
Sept/Oct twice a week x 3 weeks
Sept/Oct once a week x 6 weeks