Lego party:  1) have the children make Lego cars and race them(take a 2 X 4--with pieces of track nailed to it...you can do the races in heats and then have an overall winner  2) who can have the tallest Lego tower without if falling 3) premake things (easy or hard) depending on age group and have races to make them the quickest and most accurate 4) Lego cake sheet cake with cupcakes as the top  5) Lego can be the goody bags