Group of residents had a party, one of the residents knew a way onto the roof were they we're peeping on us.
DId you suffer any damages? Did you call police?
Can you get a lawyer? Sure.
Should you? No. Nothing in the short sentence you posted indicates anything actionable, illegal, or wrong.
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1 lawyer agrees
Construction / Development Lawyer
The person who did the peeping might need to hire a lawyer if he or she is being charged with a crime. If this is even a crime at all. Hard to say from your description.
I don't know why you would need a lawyer.