http://users.wpi.edu/~first/dyn.cgi?node=org 
We hold elections for the top positions (Directors) at the end of this years season (ie, right now). The next tier elections are held at the beginning of the new school year, and the third tier are held at the start of the season. There are a number of positions under each Mechanical and Electrical leaders which are hidden from non-team members.
All the voting is done online, with people nominating themselves for positions.