What if I don't have a mac?
How do I add calendar subscriptions to my icloud calendar if I don't have a mac?
You need an Mac to subscribe iCloud calendar see these https://support.apple.com/en-in/HT202361
- Before you can see a calendar subscription on all your devices, subscribe to the calendar on your Mac first. If you subscribe to the calendar on your iOS device, iCloud won't update it to your other devices.
If you don't have Mac either borrow from a friend for the time being , without possession of Mac it's impossible .