sd2017

They only take away the green card at the oath ceremony. At mine, they checked my documents, and stapled the green card (cancelled with a hole punched) to the oath notification letter, and returned it to me. After the oath, we went back to the counter with the documents, and they exchanged it for the naturalization certificate. At that time, you are a US citizen and will need to leave and enter the US using a US passport.

No, once you have the ceremony, you are a US citizen, and must leave and enter the US on a US passport.
 
You can apply for a passport at a passport agency, but you have to make an appointment,
 
https://www.passportappointment.us/
 
and must have international travel within the next 14 days. Thankfully for you, you're in Los Angeles, so there is a passport agency there. They can even issue a passport in time for same day travel, assuming your flight is in the evening.

You can get an InfoPass appointment to get an I-551 stamp to verify your permanent resident status, which will be valid for one year.

Indeed, while California law enforcement is not allowed to discriminate on the basis of an AB-60 license, nothing prevents non-California law enforcement from viewing an AB-60 license as a strong indication that you're likely an undocumented immigrant.

Does that include the family and friends or just the people taking the oath?

Out of curiosity, was there a reason you hired a lawyer in the first place? I ask because people usually hire a lawyer in such cases only because they anticipate some potential complications in their case. I guess I am saying that the fact you hired a lawyer suggests that you might be aware that your case isn't as straightforward as you're implying.

The absence of 6 months and 10 days would break your continuity of residence, unless you can provide evidence to the contrary:
 
https://www.uscis.gov/policymanual/HTML/PolicyManual-Volume12-PartD-Chapter3.html
 
See Section C.1, which includes examples such as:
 
•The applicant did not terminate his or her employment in the United States or obtain employment while abroad.

•The applicant’s immediate family remained in the United States.

•The applicant retained full access to his or her United States abode.
 
Did you submit evidence that you did not abandon your residence in the United States? The responsibility is on you to demonstrate that in your application, and if you did not submit any evidence, the interview officer is not obligated to ask you why you were outside the country for so long.

I have the same oath date as well, June 21 at 8am in downtown San Diego.

Thanks. If you're traveling in less than two weeks, you cannot simply use the expedited service, you need to apply for a passport through a passport agency with proof of international travel within two weeks.
 
They will only take appointments from people who need to travel in two weeks or less, and they can provide you with a passport as soon as the same day or next day, with the speed adapted to how soon you actually need the document. They will also handle applications from people who need to travel within four weeks if they also need to apply for a visa for the country they're visiting.
 
https://travel.state.gov/content/passports/en/passports/services/expedited.html
 
If you're traveling in less than 8 business days, you will pick up the passport at the passport agency, otherwise they'll mail it to you.

I'm a November filer in San Diego, had the interview on 5/3/17, and have been in line for an oath since 5/5/17, and just received notification about the oath ceremony as well.