Can I share a calendar across projects?

I have two projects running, I want to avoid overlap

You can not share a calendar across projects. 

If you have two projects running concurrently, you should set up your projects to avoid overlap. 

I.e. Project A - Availability on Monday, Tuesday and Wednesday
 Project B - Availability on Thursday & Friday

To help avoid conflicts you can also integrate with your Google Calendar. Find out more info on this integration here

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