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How can I make an event recur in a custom manner?

Install the Custom Recurring Events add-on for more options with automatically recurring events. You will be able to create events that recur every X weeks (bi-weekly, for example) or months, events that recur on the first, second, third, fourth or last week of a month (on a specific day of the week). For example, you could make an event recur on the second Sunday of every other month.