If I don't remember details, I just include title, date, place and event. Usually, I keep my photos in folders that I name with date, name, event (e.g. date/month/year_place_event, like 20May2015_NAME_birthday).
I don't know, it's probably just me but when I look at photos, I kinda remember what happened and it comes natural to write a thing or two. I'm not a fan of long journaling because I like big photos on my pages and there usually isn't enough space for text
