Simplify the following text for a Grade 11 native English-speaking person.
Original: The 1988 Summer Olympics , officially known as the Games of the XXIV Olympiad , were an all international multi-sport events celebrated from September 17 to October 2 , 1988 in Seoul , South Korea .
Simplified: The 1988 Summer Olympics , officially known as the Games of the XXIV Olympiad , were celebrated in Seoul , South Korea from September 17 , through October 2 .