How To Use The Calendar On The Iphone

Create and edit events in Calendar on iPhone

Use the Calendar app to create and edit events, appointments, and meetings.

Ask Siri. Say something like:

Learn how to ask Siri

In day view, tap at the top of the screen.
Enter the title of the event.
Tap Location or Video Call, then enter a physical location or tap FaceTime to enter a video link for a remote event.

You can also copy a FaceTime link you created or received and paste it in the Location field. See Create a link to a FaceTime call on iPhone.
Enter the start and end times for the event, the travel time, invitees, attachments, and so on. (Swipe up, if necessary, to enter all the meeting information.)
Tap Add.

You can set an alert to be reminded of an event beforehand.

Tap the event, then tap Edit near the top right.
In the event details, tap Alert.
Choose when you want to be reminded.

For example, "At time of event," "5 minutes before," or another choice.

Note: If you add the address of the event's location, Calendar uses Apple Maps to look up locations, traffic conditions, and transit options to tell you when it's time to leave.

You can add an attachment to a Calendar event to share with invitees.

Tap the event, then tap Edit near the top right.
In the event details, tap Add attachment.

The Files app opens, displaying your recently opened files.
Locate the file you want to attach.

To find the file, you can enter its name in the search field, scroll, tap folders to open them, tap Browse to look in other locations (such as iCloud Drive), and so on. See View files and folders in Files on iPhone.
Tap Done.

To remove the attachment, tap the event, tap Edit near the top right, swipe left over the attachment, then tap Remove.

Siri can suggest events found in Mail, Messages, and Safari—such as flight reservations and hotel bookings—so you can add them easily in Calendar.

Go to Settings > Calendar > Siri & Search.
Turn on Show Siri Suggestions in App to allow Siri to suggest events found in other apps.

To allow Siri to make suggestions in other apps based on how you use Calendar, turn on Learn from this App.

You can change the time of an event and any of the other event details.

Change the time: In day view, touch and hold the event, then drag it to a new time, or adjust the grab points.
Change event details: Tap the event, tap Edit near the top right, then in the event details, tap a setting to change it, or tap in a field to type new information.

In day view, tap the event, then tap Delete Event at the bottom of the screen.

Source: https://support.apple.com/guide/iphone/create-and-edit-events-iph3d110f84/ios