Click on an event to see a dialog box with the details and then go to the Activity Sign Up page to sign up. See you there!
Not working? There is a bug at Google that sometimes creates an unsolvable reCaptcha when viewing the Calendar with the Safari browser from an iOS device like an iPhone or iPad. We can’t fix Google, but you can work around the bug by either going to Settings –> Safari and turning off “Prevent Cross-Site Tracking” or by using this link to view the Calendar: HCFF Calendar. Let us know if you have problems.