Identify key players for your issue, some who might not even be aware of what's going on. Forge alliances and prepare to present a united front. Let media know your position. Understand where municipal staff members are coming from. Respect their influences with councillors, acknowledge the goals they're pursing, without capitulating to their will.
Councillors have to read a bucket-load of stuff to get prepared.
Yours should be one page, nice and neat and easy to understand. Creative recasting of an issue that satisfies various interests is more convincing that just ripping apart someone else's idea.