Dear colleague, I am happy to announce a colloquium in honor of Sabine Koppelberg on the occasion of her 60'th birthday on Friday, June 25. There will be three talks. Two of the speakers are Don Monk and Matti Rubin. The talks will start at 2 pm in Room 108/109 in the $\pi$-building of the Department of Mathematics and Computer Science (Arnimallee 2-6). Yours, Stefan Geschke