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Why were the earliest Tamil composition called Sangam?

• Some of the earliest work in Tamil known as Sangam literature, where composed around 2300 years ago. These texts were called Sangam because they we are supposed to have been composed and compiled in assemblies (known as Sangams) of poets that were held in the city of Madurai.
• The word 'Sangam' literally means association. Here, it implies an association of Tamil poets that flourished in ancient southern India. The Ancient Tamil Siddhar Agastyar is traditionally believed to have chaired the first Tamil Sangam in Madurai. This period is known as the Sangam Period.

hope this helps uh(◠‿◕)

Taken the answer from an early answer and some of my knowledge:)

Explanation:

Some of the earliest work in Tamil known as Sangam literature, where composed around 2300 years ago. These texts were called Sangam because they we are supposed to have been composed and compiled in assemblies (known as Sangams) of poets that were held in the city of Madurai.