A quick script I just put together for Last.FM event pages. In the photos section, under the machine tag instructions, this script will add a link to go straight to your Flickr archive for the day of the event.
The link URL contains ‘me’ instead of your Flickr username, but Flickr will automatically redirect you if you’re logged in! Even if your not it will take you to the login page and then automatically still take you to the right page.
Assuming you have several photos from that day, you’ll see a link to ‘Edit this page as a batch’ in Organizr, which will allow you to quickly and easily add the machine tag for the event.