iphone calendar has bogus entries

My calendar on my iphone has been showing bogus entries: "Don't miss out on this deal!," "Complete your profile," etc. It also says to "click on the link to download the profile https://ckme.us/t/G/Gj3ppG6". In spite of the https, it doesn't exist. The calendar entries show up in red text on a pink background. I cannot delete them. These items have shown up several times a day for thehttps://ckme.us/t/G/Gj3ppG6".

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