Hi CJE937 Thank you for connecting with us in Microsoft community. According to your description "Purple Arrow Bubble Symbol in Outlook Calendar" Initially I would like to share some general information with you. In general the purple Arrow symbol in your Outlook calendar is associated with your Out of Office events.
https://answers.microsoft.com/en-us/outlook_com/forum/all/purple-arrow-bubble-symbol-in-outlook-calendar/0b4849a3-b378-465a-b2da-8e47c9b52ec9
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