Having problem work on a date to work on 1 to 18 week

Hi Guy.

I'm work on formula and I can't work out to get date. I'm not that good on date. Can you help.

I'm try get formula work on Date Yellow Column I:I. Need get formula work to get a Date. Look below to work with
Season Start = 13/10/2011
Freq = 4
No Match Day = 03/11/2011, 17/11/2011 & 22/12/2011
Day = Thursday
Week = 1 to 18
New Date & Cancelled

Look at test file.