There is no formal registration for the IGOS Cryosphere workshop, but we DO want to know if you plan to attend. We request that you send a email message to the organizer (Jeff Key) stating your intention to participate in the workshop, UNLESS you've already confirmed your attendance with one of the organizers. Letting us know that you're coming is particularly important given the security at the ESTEC facility. If you're not on a list, you probably won't get in!