With the help of four GMs, I facilitated a "wide con" at Dreamation recently. We had 18 players at four tables, forming a complete squadron of four combat sections of the 588th Night Bomber Regiment. Wide con means multiple tables playing in a shared setting simultaneously, with some interaction between them, as a one-shot, usually four hours. It's inspired by "long con", which means multiple sessions of the same game sequentially over a day or two. You can also have both at once - lots of tables, multiple sessions. I've never done anything but a multi-table one-shot.
I've organized wide cons for both Night Witches and The Warren. It's a fun convention format - the room generates its own excitement, and once players begin to interact across tables it takes on a life of its own. In the most recent Night Witches wide con, they staged an impromptu funeral and it got sorta larp-y.
As a facilitator it helps a lot to have one GM per table and one extra as facilitator, host, occasional NPC and time-keeper. Night Witches is a great game for this format because it is so segmented and hierarchical. I walked around and signaled "ten minute until dusk" to each GM, and we began each night and day in unison. Managing time is progressively harder in more free-wheeling genres like The Warren.
Here's a blog post about the Night Witches wide con
with a further link to all the guidance and play materials.