Formula required to anticipate next date - taking into account blank rows

On the attached sheet is a part time shift pattern. I want to type in the column A just the day and need a formula in coumn B to generate the correct date based on the dates in sequence above - is this possible?

If possible I would like to separate each set of weekly dates with a blank row. There is a basic shift pattern of every Friday, every Saturday on a fortnightly basis and Sunday’s are random.

I require the formula to exist in column B so I can run it down the column so I don't have to paste it into specific cells. This makes it very easy to add to or update.

Thanks in advance!