The Maker Faire is a subevent of EuroOSCON, the O'Reilly European Open Source Convention which will be held in Amsterdam this year.
related items:
makezine.com
conferences.oreillynet.com/eurooscon/
European Maker Faire
At EuroOSCON
An evening where Make: magazine (the O'Reilly make your own automatically vacuuming robot or other gadgets magazine) fans can present their hardware and can compare antenna lengths. Amongst other things.
Entrance free.