Group creation & coordination for transport

[JosephMcArthur]

• [ ] choose a caboose (the final person behind). This is normally an OC person or two, one should be local. Amy B would be a good bet.
• [ ] identify group leaders (local people who can lead groups. Need one person for every one folks)
• [ ] invite group leaders (email text here: https://github.com/sparcopen/opencon/issues/137#issuecomment-343169120)