When I was thinking up a uniform format for adding concerts to the wiki, I couldn't improve on:
Location (i.e. name of the actual place he's playing), City, State, Country, Date, Specifics (i.e. if there were two shows on one night in the same place, let's add that detail).

Anybody got a better idea?

- We can't just use Date, since other things might happen on that date. Also, I'd like to keep dates as Categories.
- We can't just use City (plus Country) plus Date, because Prince might play at several places in one day
- Specifics is optional, and should only be used when there are two shows at the same place on the same date.
- State: for US dates only (?).

Also, Concerts are added to several categories:
- events for that day
- events for that month
- events for that year (this might be removed if this category gets too crowded)
- concerts for that year
- events for that venue (so we can easily find concerts that have happened in the same place over the years)
- events that have happened in this city

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[Edited 8/15/09 2:29am]

There is sites out there that have a list of tour dates.