Use an add-in like WS Repeat Appointments that supports non-standard
recurrences. I use it when necessary and it works very well.

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Milly Staples [MVP - Outlook]
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After furious head scratching, scheduler asked:
| Trying to find out how to schedule multiple meeting dates in a year
| that are not recurring either on a day of the month or day of the
| week. (Example Tuesday one month, Wed the next, skip a month then 2nd
| Thrusday)