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Both universities have calendars on their websites that list upcoming events. On NCSU's website, click on the calendar link up top, all the campus events show up, but it's not too time consuming to read through and find the free lectures. On UNC's website, click on Visitor's, then Events & Speakers. I think the UNC events page is down for maintenance at the moment, but it should be up shortly. If you need the websites, you can PM me. If this is not what you're looking for, then please disregard!