Security researchers, professionals, and enthusiasts will compete to be the fastest to solve the most puzzles in order to win cash prizes and prestige. The Facebook CTF is a 48 hour event running between Saturday, June 1st 2019 00:00:00 UTC through Monday, June 3rd 2019. At the end of the event, the team with the most points will win the following prizes: $3,133.70.70 and $2,000.00.00. The full rules and conditions can be found here.
Source: https://www.bleepingcomputer.com/news/security/the-facebook-ctf-2019-event-is-starting-in-30-minutes/