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AddToCalendar - free button for event page and email. Calendar widget to add event to calendar. Event RSVP. MailChimp compatible. Use CalendarX for Mac.
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Try this Add to Calendar Button | convenient event sharing
Add To Calendar designs, themes, templates and downloadable graphic elements on Dribbble
GitHub - AddEventInc/add-to-calendar-button: A simple and powerful add-to- calendar button for your website. Offer your users a quick and effortless way to add your events to their calendars