I have a ticket for SOLIDS Dortmund 2014 (SCHÜTTGUT) and RECYCLING-TECHNIK 2014, for 21,22 May 2014.
It's very interesting and you get a lot of free samples.
Ticket is worth 25 EURO, I sell it for 7-8 EUR, in bitcoin 0.025 BTC.
You will get an online registration code, you can find more info on the site (google SCHÜTTGUT 2014)