- Open the occurrence/meeting
- In the "to" box, delete all existing delegates and add the new delegates that you wish to send an invite
- Type your message, then click "Send Update" in the top left corner
- A window will pop up giving you the option to send that update to "Send to All" or "Send to Changed", select "Send to Changed"
These steps should allow you to send your new meeting invite/update to only your newly added delegates.