It sounds like you are looking for a way to search for specific events on multiple calendars and check if certain people are invited. In Outlook, you can use the "Propose New Time" feature to check the availability of attendees for a specific meeting time. However, this feature is only available if you are an attendee of the meeting. If you are not an attendee, you would need to ask someone who is an attendee to check the availability of the desired attendees.
Another option is to use the Productivity Insights add-in in Outlook, which provides actionable insights to help you stay on top of your tasks and get more done. This add-in can help you keep track of your commitments and ensure that you don't miss important emails or meetings.
Unfortunately, there is no built-in feature in Outlook that allows you to search for specific events on multiple calendars and check if certain people are invited. You may need to consider using a third-party tool or developing a custom solution to meet your needs.
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