There are several ways to start a group lunch:

Option 1: (not logged in)
You will see the "Start your Group Lunch" button in the home page and you may follow through after clicking it.

Option 2: (logged in)
You will see the "Start Your Group Lunch" button at the top right corner of your page.

Option 3: (logged in)
Go to your calendar, pick and click the date for your lunch and you'll see the "Start a Group Lunch" option.

Here's a short clip for visual reference:

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