As others are saying: 2e and 4e are sufficiently different games, that you cannot do a direct point-to-point mechancial conversion. It would be like trying to convert checkers to Scrabble. However, 2e and 4e have nearly identical flavor, so all you would need to do is keep nearly the same events and encounters, but replace the 2e mechanics with comparable 4e mechanics.
Note that 4e generally uses a new design ethos built around "encounters" and "skill challenges" which generally group a bunch of similar challenges (monsters/traps in encounters, skill checks into skill challenges) whereas earlier editions tended to give the party one challenge at a time (there is a trapped chest, here is an ooze, there is a diplomacy check, here is a medusa).