Dear David B69,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
Based on your description, I understand that you have a query "Delay Send Calendar Invite Request functionality."
After thorough research and consulting, you are right, there is currently no built-in feature in Classic Outlook for Windows that allows you to schedule when a calendar invitation sends. However, you can create the meeting, add the participants, and save it as a draft until you are ready to send it out. When you are ready to send the invitation, you can open the draft and click the "Send" button.
We apologize if we are not able to meet your requirements; however, thank you for bringing this to our attention, we will surely raise your concerns to our Product Team and hopefully this can be considered in the future updates.
Moreover, I would like to invite community members and MVPs in the forum to share their knowledge or any third-party workaround and insight on this topic. In the meantime, you may create an entry as a feature suggestion in the Feedback Portal at Outlook · Community (microsoft.com), Other users may vote it and make it more visible to the service team so that it may be considered for future upgrades.
For other concerns, please do not hesitate to add you post in the Microsoft Community Team.
Thank you for your cooperation and understanding.