Every second Friday at 7PM (CET/CEST for Europe and CT for North America) the top 100 A+ users are added to an A+ exclusive club. The A+ Club competition will run from 9AM-9PM regional time on Saturday AND Sunday. The top 2 players at the end of the competition are added to G.
Obtaining and maintaining Rank G is not easy, and is a challenge. Be warned, each month 10 players are also demoted from Rank G based on ranking and potential conduct violations.