spec: Add spec for Calendar group event
spec: Add spec for Calendar group event

Change-Id: I2389eee4de660c1f21e6a446dccad0b0e2b67568
Reviewed-on: https://gerrit.instructure.com/69423
Tested-by: Jenkins
Reviewed-by: Heath Hales <8ca81b68c7e2592ac614bd07f22fcc735ca55f93@instructure.com>
Product-Review: Deepeeca Soundarrajan <5bcd4b623f00b7fc2942cd1c65c245b30a48a61f@instructure.com>
QA-Review: Deepeeca Soundarrajan <5bcd4b623f00b7fc2942cd1c65c245b30a48a61f@instructure.com>

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