Dear Game Masters,
I wonder if I am creative enough to offer you ideas for events. Would you be interested at all? Would you be allowed to accept any, at all? Would I have to be excluded from an event I contributed?
If allowed and interested: How about publishing a very coarse topic and collecting more details to finalize a specific event plot in a not-so-public area, e.g. an IRC channel, protected by a part-time password given to registered contributors for just this event planning? As usual, the plots don't have to be too elaborate, enough for an hour, maybe with one sequel at most.