[Tom I]

Team 811 is actually facing a similar situation, we've almost doubled our numbers from previous years, with now more than 50 members, all of whom are extremely active and show up almost every meeting with only a couple exceptions. The good news is this is our 11th year, and we have a pretty good system in place.

Best advice would be to set up a central heirarchy and subteam breakdown. My team has 4 "robot focused" subteams: Mechanical, Programming, Wiring, and GOD Squad (Governance, Organization, and Drivers). We also have non-robot focused, but equally important subteams: Marketing, 3D, CAD, and Website.
The subteams each have 1 or 2 leads depending on size, who report to the team leads. Together, these leads do the majority of the organization, as the team is completely student run.

After you have some sort of organizational breakdown, set up a routine for staying on track. Before each meeting, the subteam leads report to the leads of what they hope to get done, and there's a schedule to keep everyone on the same timeline. With a routine order, things will fall into place. But don't be discouraged if things are rocky at first, best thing is to learn from mistakes. good luck!