I am unable to add a calendar event to my iPhone 6. The plus sign is shaded. How do I get it red again?

Greetings kimtullis,

It seems you are unable to update your Calendar. That does sound troublesome. The following article provides steps which may help you find a solution:

Get help using iCloud Calendar - Apple Support

iOS

After each step, check to see if the issue still exists.

Turn on iCloud Calendar and update your device

• In iOS 7 or later, tap Settings > iCloud on your iPhone, iPad, or iPod touch and make sure that Calendar is turned on.
• Install the latest version of iOS that's supported by your device.

Check you Internet connection

1. Open Safari and go to www.apple.com. If you can't connect to the Internet, your iCloud calendars and events won’t update in the Calendar app. Get help with your Internet connection.
2. Try to open a secure website from your iOS device to see if you can access ports 80 and 443. If the website doesn't open, you don't have access. Contact your Internet service provider for help. Safari requires access to port 443 to push updates between iCloud and your devices.

Refresh your calendars

1. Open Calendar and tap the Calendars tab to load the Calendars list.
2. Pull down on the list to refresh.

If you’re seeing issues with the iCloud Birthdays calendar, remember that it updates hourly. It might take up to an hour for changes to the birthday field in iCloud Contacts to show up in iCloud Calendar.

Check your default Calendar account

If you store and edit your events using your iCloud account instead of a third-party account, like Google or Yahoo, iCloud will automatically update your calendars.

In iOS 7 or later, see which calendar account your events are updating through:

1. Open the Calendar app on your device and tap an event to view Event Details.
2. Tap the calendar name to see if the event is updating through an iCloud calendar.

If your device uses multiple accounts like iCloud, Google, and Yahoo, make sure your iCloud calendar is the default Calendar account:

1. On your device, tap Settings > Mail, Contacts, Calendars > Default Calendar.
2. Tap an iCloud calendar to make it your default Calendar account.

Change your sync settings

1. Tap Settings > Mail, Contacts, Calendars.
2. Under Calendars, tap Sync. If Sync is set to All Events, set it to a specific timeframe, such as Events 1 Month Back. If it's already set to a specific duration, set it to All Events.
3. Tap the Home button.
4. Wait several minutes. Open Calendar, tap Calendars, and pull down to refresh.

Restart Calendar

Close and restart the Calendar app on your iOS device.

iOS 7 or later:

1. Double-click the Home button to see your open apps.
2. Find the Calendar preview screen and swipe it up to close the app.
3. Press the Home button to return to your Home screen.
4. Wait a minute, then reopen the Calendar app.

Turn off iCloud Calendar and turn it back on

1. Tap Settings > iCloud.
2. Turn off Calendar.
3. You can choose Delete from My [device] if your data exists on icloud.com/calendar and one or more of your devices. Otherwise, choose Keep on My [device].
4. Wait a few minutes, then turn Calendar back on.

Restart your device

Hold down the Sleep/Wake button, then drag the slider when asked to power off. Turn your device back on.

Thank you for contributing to Apple Support Communities.

Best,

Bobby_D