Calendar on Mac Powerbook Pro with Mavericks not pushing events to iPhone via iCloud. I've followed all the troubleshooting suggestions and nothing works.

Have you tried completely singing out of your iCloud account, deleting the iCloud data, then singing back in? If not, go to System Preferences>iCloud, click Sign Out, choose Delete at all of the prompts (your data will still be in iCloud), restart your Mac, then go back and sign back in. Your iCloud data will download back to your Mac when you sign back in. Then check icloud.com to see if your Mac calendar appears there.

It only deletes iCloud calendars. If your calendar isn't in iCloud it won't be deleted. But if you're nervous about doing this, back them up first by selecting each calendar on the left sidebar of the Calendar app and going to File>Export>Export. This will create .ics files that can later be used to import your calendars back to your Mac, if necessary.

What happens when you add a test event to the iCloud calendar on your Mac, does it appear on icloud.com? (You only mentioned it not appearing on your phone.) This will determine if the problem is with your phone or your Mac.

You won't have to imput all your calendar events again. And you don't have to enter the events on icloud.com to have them sync with your devices. When it's working properly, you can enter the event on any of your devices/computers and it will automatically appear on the others. The calendar on icloud.com just gives you a way to view your calendar when you don't have access to your devices/computers, such as when you are traveling or using someone else's computer.

I had asked that you add an event on the calendar on your Mac and then go to the calendar on icloud.com to see it it appeared there. This was only to see if events added to your Mac were properly uploading to iCloud. Do you ever try this? If so, was the calendar event added to your Mac visible on icloud.com?

Do you have any calendars showing on icloud.com?

Also, when you open the calendar application on your Mac and look at the left sidebar, is the calendar listed under the heading "iCloud"?

Please answer the following:

1. Do the calendars appear on icloud.com? If so, are they empty there or do they contain events?

2. Are the calendars listed under the heading "iCloud" in the calendar application on your Mac, like the image below?

If you calendar is now syncing new events to iCloud, let's rebuild your iCloud calendar. Do the following:

1. Select each of your calendars on the left sidebar on your Mac and back them up as you did before, by going to File>Export>Export and saving the .ics files to your desktop.
2. Delete each of your calendars on your Mac by control-clicking on them and selecting Delete. Go to icloud.com and confirm that your calendars are no longer there.
3. Add a calendar back to your Mac by opening the calendar application and going to File>New Calendar>iCloud and giving it the name of one of your calendars. Repeat for each of the calendars you deleted. When you are done, you should have empty calendars for each of the calendars you delete earlier. Go to icloud.com to confirm these empty calendars appear there too.
4. In the calendar application on your Mac go to File>Import>Import and navigate to one of the .ics files you saved earlier. When asked where to import it, click the drop-down list and select the empty iCloud version of the calendar you are importing, then Import. Wait until the spinning progress wheel stops at the top of the left sidebar. Repeat this for each of your other calendars.
5. Check the calendars on your Mac and on icloud.com to confirm that all your calendar events appear now. They should also now appear on your phone. Then add another test event to the calendar on your Mac and confirm that it appears on icloud.com and your iPhone now. If so, everything is now working properly.

Is this a calendar you are syncing with your work exchange account?