Are the rest of the events from that shared calendar showing up in your HipChat sidebar? It's possible that shared calendar isn't checked in your integration settings. You can access the settings using the gear icon in the upper right of the UI:
HipChat 2016-12-27 17-18-19.png
...have mention name FirstnameLastname. Fe.: @MaartenCautreels This certainly helps to know who is being mentioned in a conversation. Imagine your colleague sends the following message...
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