Based on what criteria is the 500 people selected? If they have a common denominator, such as all of them have a specific profile field selected (for example) then you can select them all in your Usergroup manager and move them into a new usergroup. Otherwise, if you don't want to 'force' them. I would suggest possibly considering something a bit more unique, such as only showing an invite link to your newly created ground (which is joinable) on the homepage (or wherever) and have them click in case they want to join. This can be done with a bit of clever coding. If you give me more specific details, i may be able to suggest something.
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