Events and places near the conference site:

Really near the conference site:
1. KOOZA (Cirque du Soleil): taking place just beside the conference venue

2. National Museum of Art, Osaka: just three minutes' walk

3. Osaka Science Museum: in the same site as National Museum. Planetarium

Other places:

4. Osaka Castle: rebuilt after the World War 2

5. Osaka Castle Summer Festival "Shiroakarino-E" (Candle Lighting): 18:00-21:00, Aug. 27-28, 2011. The linked website is in Jap. Sorry.

6. Osaka Aquarium Kaiyukan: one of the largest aquarium in Osaka

7.Universal Studio Japan:

8. Museum of Oriental Ceramics: two stations away. Get off at Naniwa-bashi station.

9. Tennoji Zoo: the zoo in Osaka

"Depa-chika" or the basement of department stores: it's quite different, and interesting