Join with us and other members of the community to learn about and to discuss the proposal of the Mayor Mansoor to enter an agreement with the federal government to cause to comply with the immigration laws. This theme affects us to all. Its impact is very extensive and itself is not limited to the immigrant community. We expect that you lend your voice to this very important discussion.
Or something like that.
I would use the word "Unite" rather than "Join" - especially since this this the UNITED States made great by immigrants - home of the brave and land of the free - where Lady Liberty gives hope and seeks the world's poor, tired, huddled masses . . .