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Not an add-on, but if you pull up the date that holds your meeting, then hold down the Ctrl button on your keyboard while clicking the other days you want to copy the meeting to. Once you have all the dates in your view, hold down the Ctrl button again, click on your original meeting and drag it to each new date. You can move it to any time you want and it will copy all the information from your original meeting with the new date and time set appropriately.