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As you begin using the Calendar app, you’ll discover that there are many ways to customize it beyond choosing between the various calendar views. For example, from the Calendar app, you can set audible alerts to remind you of appointments, meetings, and events.
To customize the audio alert generated by the Calendar app, launch the Settings app, and then select the General option. Next, tap on the Sounds option.
Make sure the Calendar Alerts option, displayed in the Sounds screen of Settings, is turned on. If this option is turned off, a text-based message displays on the iPhone or iPad’s screen as an event reminder instead of an audible alarm sounding.
If you are able to receive meeting or event invites from others, from the Settings app, tap on the Mail, Contacts and Calendars option. Then scroll down to the Calendars heading and make sure the New Invitations Alerts option is turned on. This enables you to hear an audible alarm when you receive a new invitation.