How to prevent ical from adding any number in notes as an uneditable phone number

Hi LFdeg,

Are the numbers coming over from the event that was added to the Calendar app? If so, where is the event coming from? Are you creating it, bringing it over from an email, getting a calendar invite, etc?

Also, let's see if it allows you to modify the event by completing the steps listed here: Add, modify, or delete events in Calendar on Mac - Apple Support (QA) that are also listed below.

1. In the Calendar app  on your Mac, double-click or force click the event to open it.

2. If you created the event, you can do any of the following:

Create or modify all-day or multiday events

Set up a repeating event

Add location and travel time to events

Set event alerts and receive notifications

Invite people to events

Add a FaceTime video call

Add notes, a URL, or files to events

Move events to another calendar

Use different time zones

Siri: Say something like: “Change my lunch from 12:30 to 1 p.m.” Learn how to ask Siri.

To change an event’s start or end time, you can drag the top or bottom edge of the event. You can also drag the left or right edge of all-day events.

To change an event’s date or time, drag the event to another day or time. You can also drag the event to the small calendar in the bottom left of the calendar list. To view the calendar list, choose View > Show Calendar List.

If you didn’t create the event, you can change your acceptance status. You may also be able to leave a comment for the event organizer or propose a new time. See Reply to invitations.

Best regards