Get on the agenda. Present your issues in the petition, know your facts and be prepared to defend your position. Thank them for their consideration. Lobby with signs and handouts. You can always try next year.
Timing is important.
Prepare students for this and have them rewrite the petition with the help of a legal person, maybe the wording was vague or the town has a similar law on the books. This procedure worked for us and it can for any class. They carried out the necessary steps and proved an elementary school student body, when informed, can make a difference and create a piece of legislation for the future. It is very important to follow up any letters sent or received, phone calls, thank-you notes, any show of support or appreciation, even to the news reporters who wrote articles about you. You must channel their energy in the proper avenues for success, a teacher is their guide.