Just one person's perspective on it - Ed's right, but now let me present my dilemma.
>I don't find the lead time to be a problem and agree with those who have >pointed out strategies to inject current issues into preplanned sessions. >Program committees are very concerned about having up-to-date sessions and >make efforts to enlist speakers capable of adapting their presentations.
A number of people asked me why I wasn't speaking/presenting about The Geometry Forum. Mainly because of the lead time. It's very hard to tell, with a grant-based project that employs one full-time person, what we'll be doing a year in advance. For next year, for instance, we don't even know if we'll have any money to do anything, much less travel to San Diego. So it's easier for us (and we're lucky to be able) to hang with someone in the exhibit hall and hope to reach as many people as possible.
So how do I work around that? Take my chances and push my luck?