In order to get the DUSWPC calendar on your iPhone you'll have to add it into your calendar app. If you use Google calendar normally then follow the Android instructions
Go to Settings, and then tap Accounts and Passwords
Tap Add Account
Tap Other
Tap Add Subscribed Calendar
In the server box, paste the following:
https://calendar.google.com/calendar/ical/duswpc%40gmail.com/public/basic.ics
You can add a description such as DUSWPC Club Calendar for ease, but that's up to you!
In order to get the DUSWPC Club Calendar on your Google Calendar you will have to add it to your Google Calendar on your web browser using a laptop - not your phone. Don't worry - this is a one off process!
Go to calendar.google.com and make sure you are signed into the correct account (the one you use on your phone)
Click on the settings cog and then click 'settings'
Click 'add calendar' from the left hand menu
Click 'Subscribe to a calendar'
Type 'duswpc@gmail.com' in the box and hit the enter key
Step 6
On your phone, open the google calendar app and go to settings
Step 7
Select the DUSWPC calendar
Step 8
Click sync