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Upon employment termination,

Bring all that is in the checklist.  And if you feel you need more, bring whatever you feel may support your "case".  Chances are the officer will not ask for more as they probably have all that they need in your file.  You will see, everything you submitted from your day 1 of your immigration journey will be in front of you (with the interviewing officer) on the day of the interview.   All that was asked from me during my interview by the IO were:  green card, DL and the Notice.  Am guessing those are necessary to verify that they have the right person in front of them.  You just have to be consistent with your answers and as always, be truthful.  The officer will go thru ALL the questions in the N-400 form in addition to the civics test.  

How about a civil wedding first then you can have your church wedding when you get here so you have time to prepare.

Expired green card is not a problem during N-400.  

In some ceremonies, there are reps from Social Security, US Dept of State and Elections  board,  you can apply for your passport after the ceremony provided you have all that is required - form (duly accomplished), fee (MO or checque),  photograph and the Naturalization Certificate (signed by you) and you have been sworn in ( On top of being sworn in as a citizen). It is mentioned in the letter if those will be available on the day of your ceremony.  So one-stop shop to: update Social Security status, register to vote and....apply for passport.