Apple quietly added a long needed feature to iCloud.com which allows you restore previous versions of your backed up iCloud content including photos, contacts, calendars and files. About a month ago this would have been a huge help as I was searching for a number I had deleted from my contacts back in January. Luckily I was able to restore that number by finding an old text message conversation I had with this number on my iPad. Quick Tip: If you delete an SMS/iMessage thread on your iPhone it will ONLY be removed from that device. You can still access that thread on other iOS devices such as the iPad and even the Apple Watch. I digress.

Now when you login to your iCloud account via iCloud.com you can access previous revisions of your data. While you can't specifically restore a contact, photo or calendar individually you can restore a copy from a set time period. So in order for you to restore the data you are looking for you would need to have a good idea of when you actually removed it from your device. Here are the steps you need to take in order to make this happen:

Login to your iCloud account through your web browser at iCloud.com.
Navigate to the Settings and scroll down to the Advanced section
You will be presented with options to restore Files, Contacts, Calendars and Reminders.
Select the option you want to restore and you will be presented with a list of dates you can choose to restore from.
Scroll to your date and select the restore button.
Voila.