"about last party" is ungrammatical. "about the last party", "about the last party I went to " and "about my last party" are all possible English phrases, but in reality, unless some special emphasis is needed, someone is more likely to say something like "You asked me to tell you about the party I went to / held the other day / on Monday / recently" ("held" if the speaker arranged the party; "went to" if someone else did). "the party's photos" is awkward.
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