Comma or no comma [closed]
Solution 1:
Yes and No.
If you use the comma, then you should put it also after that, and in this case, you will have a so called helper clause - in all weeks, which just adds more specificity to the context.
If you don't have a comma after that, then you should not use a comma after weeks, as despite the fact, that the part after the possible comma can constitute an independent clause, the whole sentence is a complex sentence, having both - dependent and independent clauses, but not two independent clauses.