Borderlands 3 has been updated to version 1.80 today by Gearbox. You can find out the complete patch notes for this update from here.
This patch brings in a small number of fixes that were outlined by Gearbox Software on their official website. This activates two different events including Mayhem Made Mild and Show me Eridium. The details were shared on the official website, but you can view the patch notes below.