I can see it either way: 1) assume people will just go to the WGs they are most involved in, and facilitate as well as possible people going for the minimum number of days (which means publishing agendas as early as possible, with caveats that they might change). Discourage people from attending anything they haven't been following. Make it boring and incomprehensible on purpose for people who haven't been involved in that WG, so that you don't get "tourists", or
2) assume cross-fertilization is good. That it's good for people to get exposed to other WGs. Realize people can't follow the mailing list of more than a few groups. Encourage "tourists" at WGs by explaining what's going on. Perhaps starting out with a 15 minute explanation of what the current controversies are. So that someone that is generally knowledgeable but hasn't been following some WG can pick up most of what's happening by attending the meeting. Frankly, I think this would be a good idea, for many reasons, including it would force the WG to summarize what it's up to, which would help them organize their thoughts technically. So the WG itself would benefit, not just the tourists. Radia
