With a spreadsheet you are gonna get the problem of how people can edit it, unless one person offers to complete it all...we need something that everyone can access online, and add their own travel plans to
Ive just found Google calender
, which seems to work pretty well, I just set up a calender on there and you can invite people to view and edit it, but you have to register for a google account first, which isnt a big deal.
Ive created a calender called Tpunks, which i have made public, but i think you still have to register before you can see it.
Once you register you can pm me with your email address then i can invite you, meaning you can add your own travel plans