There's nothing more naive and depressing than young activists who think deferring the editing of a document to AFTER dozens of people join your org is a bright and novel idea.
Repeat after me: Do not edit by committee. Do not design by committee. Do not delegate any actual work to a committee. Ever.

Committees are a means of delegating a few decisions to a smaller group. They're good at taking the time to bring all views on board and arrive at something approaching consensus.
But actual work is a process including many micro-decisions, and slowing each of those down by the committee process dooms a project.
Best practice: delegate the work itself to 1-5 people, then have a committee or assembly critique and possibly approve the final product (document, logo, etc).