I don't think it's necessary if you don't feel you want to or can. I've never been to either, so I'm not sure, but from reading here, I get the impression that the weekends of recovery are more geared to the individual taking part in activities and group meetings and talking to counselors and other survivors, etc. I think, and again, I don't really know, that this conference is much more general and informative. From looking over the workshops, it seems there are certainly opportunities for participating, but I don't believe it's thrust upon you.
If I'm wrong, I'm sure someone will set it straight.
If you fall down 10 times, Stand up 11.