I can do two events and that would work however I am still in a quandary over how to select the particular week in a month given that the first three weekdays of any 31-day month are repeated 5 times within that month. So, any month that has 31 days and begins on a Friday has 5 Fridays, 5 Saturdays, and 5 Sundays. If I create an event several months in the past and select a two week interval for a Friday and the month previous to the current month had 5 Fridays then in the current month my event will show up in the first week of the month rather than in the second week as I had intended. Thanks for your help with this issue.
You can select a 2-weeks interval, but the event will happen every 2 weeks and not in the 2nd and 4th week. As you said, if a month has 5 weeks and you create an event in the 2nd, it will happen again in the 4th but in the 1st of the next month.
You need to select a first day for the event, and then, in the Recurrence tab, you have the option to specifically select that you want the event in a specific week on the month.
But this option doesn't allow you to select multiple weeks. That's why you need to split the event in two, as the image attached: