No, Outlook has no way of doing this natively but there is a third party tool, WS Repeat Appointments, that will allow you to set irregular recurrences.

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Milly Staples [MVP - Outlook]
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After furious head scratching, Dakota asked:
| Is there a way to enter repeating meeting dates that don't meet on a
| regular basis? I meet 3 days every week with a company, but they are
| not always the same days each week. Another program let me type in
| specific dates when the repeating dates were irregular.