mark an historic event
would you tell what mark mean in this sentence?
as the world knows, recently, the United States of America got it's very first African American president. and today, we find out how one French Londoner decided to mark this historic event.

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'mark' it means do something to remember it/celebrate it,
 like you put a bookmark in a book to remember where you are.

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To "mark" an event is to do something special.

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A historic event;  
some annoying people say 'an historic' but that makes no sense because 'h' isn't silent!
However, they never say 'an history book'!..  :(