OK try this then, in Excel create a table with the Friday dates for a long period of time. Say in B1 = Type in Friday Dates, then in B2 add in the first Friday then in B3 add in the Next Friday then highlight the 2 and drag on the autofill down until you have say 1 years of Friday (Just to see if this works you can adjust once tested). Then highlight B1 down and copy the date.
Next open the database select the tables tab (in the navigation bar) and use paste. This should copy the dates into a new table. Then in your table where you want to use them select the Data Type and select the Wizard at the bottom find the table with the dates in follow the steps to the end of the wizard and you have a solution that you can tie into a query and form.
Job done.