Short Answer 
To update a calendar event in Outlook, open the specific event, make minor changes such as adding personal reminders or adjusting your availability, and save the changes without selecting “Send Update” to avoid notifying attendees.
Step 1: Open the Calendar Event
Begin by launching the Outlook application and navigating to your calendar. Locate the specific event you wish to update. To do this, simply click on the meeting in your calendar, which will open up the event details page.
Step 2: Make Necessary Changes
Once the event is open, you can edit the details as needed. This may include changes to personal notes or reminders that do not impact the meeting itself. It’s important to ensure that the alterations are minor, such as:
- Adding personal reminders
- Adjusting your availability status
- Modifying notes for your own reference
Step 3: Save Changes without Sending Updates
After making your desired changes, save the edits by selecting either “Save” or “Save and Close.” Ensure that you do not click on “Send Update,” as this will notify all attendees of the meeting. This method will only refresh the event on your calendar, keeping invitees unaware of the minor tweaks.