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Does anyone have a recommendation for a calendar system that is SEO friendly?  I have been using Helios Calendar but the current version lacks proper SEO bones (canonical URLs, mini calendar generates links to empty events from 1950 to 2020, 302 re-directs, and it is generating thousands of crawl errors in Google Webmaster Tools. The developer has plans to implement some fixes, and I would rather not rip apart what is currently there to fix core issues. I have found that calendars in general are a nightmare.  If anyone has any suggestions, or has experience in tidying up Helios I would be interested. Thanks, Dan