Adding Ironmen 2018 Calendar to your iPhone Calendar....
1. Go to your Setting app.
2. Click on "Mail, Contact, Calendars'
3. Click on 'Add Account'
4. Then, click on 'Other'
5. Then click on 'Add Subscribed Calendar'
6. Under 'Server' cut and paste the link below
Then hit 'Next', fill in the option info and you should be good to go.