Welcome to the forum.
The today function will give today's date. The weekday function will return the day of the week, I will use weekday(today(),16) to return day of the week as numbers 1 (Saturday) to 7 (Friday).
You should be able to combine these to get the last Saturday as follows:
Formula:
=TODAY()+WEEKDAY(TODAY(),16)-1
(this will give today's date if today is a Saturday)
You can then add or subtract as many sets of 7 days as you like to find future or past Saturdays.
I.e. Assuming above formula is in cell A1, next Saturday is calculated as:
Formula:
=A1+7
Hope this helps (and works!)
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