Bonalu festival Celebrated in Telangana

Bonalu is a Hindu Festival where Goddess Mahakali is worshiped. It is an annual festival celebrated in the twin Cities Hyderabad and Secunderabad and other parts of Telangana state, India.
Celebrated usually during Ashada Masam that falls in July/August. Special poojas are performed for goddess Yellamma during the first and last day of the festival.
The festival history reportedly started in 1813 in the region of Hyderabad & Secunderabad when plague disease had broken out in Twin Cities that had claimed thousands of lives.