You do not have to make a full commitment to attend at this point, although if you can be fairly accurate about your attendance, it would help in planning.
A list of "missing" classmates will be posted on the site soon, after some recent contact information has been updated in the current list. Be sure to share the class website address with any classmates you know -- it's going to be a fun time!
As Willy Wonka said, "So much time and so little to do. Wait a minute. Strike that. Reverse it. Thank you."