AP PHOTOS: Colorful roadshows and rallies mark India's election season before voting starts Friday

Every five years, the world’s most populous democracy holds a giant election for millions of Indians to cast their vote on a new parliament.

And it does so in its usual flamboyance — with a spectacle of dance, drumbeats and firecrackers echoing across India as candidates march in processions to canvass for votes.

Colorful convoys of motorbikes, jeeps and autorickshaws have been navigating narrow streets in cities and towns as people line up to glimpse the contestants.

The six-week national election will start Friday with polling scheduled in 21 states in the first phase.

From April 19 to June 1, nearly 970 million Indians — or over 10% of the global population — are eligible to vote to elect a total of 543 lawmakers in the lower house of parliament.

Among the states voting on Friday is southern Tamil Nadu, where mega cardboard cutouts of political leaders are a common sight during the election season.

Indian Prime Minister Narendra Modi’s Bharatiya Janata Party has been trying...