Start with the catalogue, not your camera roll
If you cannot remember whether you saw a band in 2018 or 2019, do not start in Photos. Search the artist in Radar Find or on Setlist.fm and scan the year list. Past dates are usually easier to match than blurry Instagram stories.
Ticket confirmation emails and banking statements with the venue name are the next best evidence. Once you have a city and a month, the official setlist archive almost always has the night.
Match the night you actually attended
Tours repeat cities. The date that matters is the one you were in the room — not the first night of the run. Support acts, a friend’s story, or a merch photo of the city skyline usually settle it.
Log the gig in Radar with artist, venue, and date. Attach the Setlist.fm page so the songs sit on the same card as who you went with. That is the difference between a tour Wikipedia page and a concert diary.
Backfill a whole artist, not one show
Once one date is solid, search the same artist for other years you were going out. Most fans find two or three extra nights they had completely forgotten.
Radar keeps every past gig in one timeline with Find for upcoming dates of the same artist. You are not maintaining a spreadsheet of tour legs — you are building the nights you were there.