I'm not sure of the best way for this to work, but as well as the "Geekup" and legacy "Lisalicious" tag on Geekup events, I've also given each one a kindof 'unique ID', so that Flickr photos from each event can be mapped directly.

Technically it should be doable using date fields and separate tag for the location, but I have a feeling that's rather harder to do than just matching a tag directly.

So for now, I've tagged them GeekupLocationNumber: So GeekupManchester4 and GeekupManchester5 and so on. If you'd be good enough to add those tags to any photos you upload that'd be good.

If someone has a better idea, that's good too.