One of the questions that puzzles people creating open collaboration
projects is that after you put out there that your project is
participatory and relatively non-hierarchical, is that how do you get
them to participate??
One of the things to do is create a task list, that allows people to
scan through to see if there is anything there they would like to do.
If there isn’t a task list, people can be left floundering, not
knowing how to get their foot in the door. Little tasks especially can
help people get their foot in the door.
On Wikipedia there are a lot of little tasks you can begin with to
start contributing e.g. you can make a spelling or grammar edit. These
little tasks can then embolden you to start contributing more to it.
Here is a good blog article which talks about how the importance of
creating task lists in volunteer organizations.