Steve recently tweeted: “wonder if there’s a good way of using postcodes, standardized time & airport TLAs to make gig dates searchable on twitter.”
I’m not sure airport TLAs work well – they are biased towards major cities and, if a city is major enough, you then have to pick which airport to focus on. A two letter country code would work just as well, given that you would then want to include a country-specific postcode to zoom in on the action.
In fact, while I like the idea of tagging to add meaning, I’m not sure it is workable in the limited scope of a 140 character tweet. You need a country (two characters), a postcode (in the UK that could just be the first half – 3 or 4 characters), a date (at least 6 characters, eg YYMMDD) and something like #gig to set a context. That is about ten percent of your allowance used up even before you put in specifics, like the name of the town or venue and something to explain what kind of gig it is.
Instead, something like “Playing an #Oxford #gig tomorrow” is concise, easily read and could be backed up with a link to a service like upcoming.com or last.fm which provide much more nuanced tools for discovering what is going on.