"await" is used for "expecting" or "looking forward to," otherwise we use "wait" Also, it's not very common to use it in the past tense, except in the phrase "long awaited," which means something you have been waiting for for a long time. So your sentence could say "In the year 2010, during my visit to the World Expo in Shanghai, I was presented with a robot show in the Japan Pavilion after waiting for two hours." However, "presented" in this context sounds a little unnatural. Normally something intended for a large audience (like a show, a movie, a concert) is not considered to be "presented" to one person, rather a person attends a show, or concert, or movie. It would be slightly more natural to say "In 2010, during my visit to the World Expo in Shanghai, I waited for two hours to attend (or watch) a robot show in the Japan Pavilion."