I would totally be interested in an Enworld game because there were only four or five 3.5 games in the event listing that sounded fun to me. But last year I don't remember a single game being advertised on that forum (or else they were just full by the time I found out about it, or they weren't 3.5 so I ignored them).
There were about 20 events or so last year. An incomplete list of the 2009 ENworld events is
here. There also tend to be many more that are created informally via PM between ENWorlders that have met one another or participated in each other's events over the years that you don't hear about.
In all honesty? I would DEFINITELY reassess your interest in only signing up for 3.5 events. Don't get me wrong, I can well understand your preference for playing 3.5 in a weekly game - but a preference in a campaign vs the nature of a RPG one-shot at Gencon are very, very different, imo.
The rules of any session are generally minimalized and combat tends to also be minimized. Roleplaying and setting is VASTLY more emphasized at all such events.
You really will sell yourself short on some great games by putting the system blinders on at Gencon. Please appreciate that I am
not saying that means you should play in such a setting or system as part of an ongoing campaign. If you have little interest in the system - you won't like rolling a character and playing week-to-week under it. I totally agree.
But the nature of one-shots is that the rules tend to barely be there to begin with. One-shot convention games are just a very different RPG experience, imo. Your characters are pre-generated and provided. Any necessary rules for you to know are almost always on the character sheet. The scenario is almost never open-ended and is tightly controlled by the GM.
In the end, you are participating in a game sessions where plots, puzzles and role-playing is king. Level advancement, rules, power level, and the intracies of combat just fade into the background in the large majority of events.
More often than not, you'd be hard pressed to know what game system you were playing in if you didn't look at your character sheet. Might be Savage Worlds; might be Runequest; might be D20 Modern; could be 3.xx Pathfinder or 4E. I have generally found that most of the time, we never get so deep in to the granularity of the system that I have much cause to even notice.
