Lee hung out with the twins and probably kept the troops entertained whilst they were waiting for the delegations. He thought the carriage and the ship were cool and he would have gotten really excited about Krum being there. Boy appreciates a Quidditch player. He, perhaps to some people's surprise, wouldn't have ogled the girls arriving, mainly because he's not really as charmed by pretty ladies from a distance. During Dumbledore's speech he would have listened for the most part, booed the bit about the age line, and talked frantically with the twins about ways to get past it.