In order to set all 1-1 Chat calendars for your entire team all you need to do its long into your dashboard and click on the 1-1 Chat tab and click on 'Manage 1-1 Chats for Colleagues':

After clicking on Manage 1-1 Chats for Colleagues you will be forwarded to a list of the colleagues that have been invited this the event. After clicking on 'Set up Availability' you will be able to configure the individual 1-1 Chat calendars of all of your colleagues by clicking on the various time slots with green indicating available, white indicating are unavailable and the dark grey indicating are already booked.

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