You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
Note: This feature may not be available in some browsers.
Most of the invites were sent out the last week in March. If you didn't get one, or RSVP before midnight last night, you're probably out of luck unless you want to try and crash the gate and take your chances.