The really simple answer is you need to hire an attorney asap.
Legal disclaimer: The statement above is general in nature, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship.
Expungement is for after conviction and after probation is done, but you haven't been convicted yet, as I understand it. Your best strategy isa strong defense. Maybe there was an illegal search? Consult a good lawyer for guidance. Most, like me, offer free consultations.
There is nothing to vacate or expunge while your case is still pending. Be sure you have an attorney who understands immigration consequences for your criminal case.
Ordinary expungement procedures will NOT erase a conviction for the purposes of immigration.
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I think what you are saying is that you were convicted of possession of a weapong but that you have a future immigration court date. Possession of a firearm is a bar to Deferred Action. Unclear what weapon you had. It is true that if you receive an expungement, then USCIS will not automatically deny the application based on your criminal history but weigh and balance the factors in the case. However, you generally need to have completed your probation to get an expungement. It is possible to ask the Superior Court to shorten probation and to give you an expungement, but as you can imagine that is probably an uphill battle in this type of case.
An expungement would just be the first piece of the puzzle. The other part would be to present very compelling evidence that you are not dangerous. That would be statements from many many people talking about who you are, and any other evidence relating to your character (i.e. volunteer work, etc). Good luck.