Update _index.md

Author: wsmoses

content/getting_involved/_index.md

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 The Enzyme community aims to be open and welcoming, and as an LLVM Incubator Project we follow the [LLVM Community Code of Conduct](https://llvm.org/docs/CodeOfConduct.html). If you'd like to participate, you can do so in a number of ways:
 
 * Join our [mailing list](https://groups.google.com/d/forum/enzyme-dev)
-* Join our weekly [open-design call](https://mit.zoom.us/j/96000853439)
+* Join our weekly [open-design call](https://mit.zoom.us/j/96000853439). See the [Enzyme Calendar](https://calendar.google.com/calendar/u/0?cid=cjQ5cjFya2V1anVycnE0ODR2MmFqbmZpZm9AZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ) for details
 * Participate in development on [Github](https://github.com/EnzymeAD/Enzyme)
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