Can I change my attending status to maybe or no (not sure if I can attend yet) without deleting my account

Hi, there. I joined the barcamp Seattle site, because this seems like a terrific event, but I'm not sure yet if I can attend. I've got some other tentative trips in and around the date, and my schedule is in flux.

Is there a way to change my status to tentatively attending or not attending, if it looks like I can't come? I'd still like to belong to the community for the site, though, if possible.
Thanks! TSFrench