Identify this world famous contest which is held every year

The balloons you see are not there for timepass, they are used to display “scores”.

Cracked by: Raghuvansh , piezocake , yaksha , Dibyo , Rogi , udupendra , p vs np and sidsen

shrik has a nice funda. Check it out.

Answer:

The ACM ICPC. Its a programming contest and for each problem you solve, you get a balloon tied to your table.