Big time and Clambake

Big time noun - The highest level of a field of endeavor.

Clambake and big time are semantically related In some cases you can use "Clambake" instead a noun phrase "Big time".

Clambake noun - A cookout at the seashore where clams and fish and other foods are cooked--usually on heated stones covered with seaweed.

Big time and clambake are semantically related in amusement topic. Sometimes you can use "Big time" instead a noun "Clambake".