I booked the ceremony last summer thinking I would get my visa by this summer, but unfortunately USCIS skipped my I-129f so it caused extra 3-4 months for my visa process. And according to everyone's suggestion, it's better not to have any kind of ceremony before the visa otherwise it'd be considered "too married for K1", so I managed to postpone the ceremonies to next Autumn, and for the venue usually needs to be reserved one year in advance to secure the date. I think I should be able to file for the Advance Parole by the end of this year. According to other's timeline, it could take from 3-12 months to get AP. I would be happy as long as I can get it within 9 months, but if bad luck happens again I will have to file for an expedite.
I do see that USCIS list Wedding or personal commitment as one of the reasons to get expedite on their official website, under the catogory under Humanitarian parole. So I want to see if anyone has any kind of experience of doing that.