Dear Sherwin, GATE has extended the last date for registration with late fee and without late fee. So at this point in time, October 5th is the last date for registering for GATE 2020 with late fees. Once the registration period is closed, IIT Delhi will open its correction window for various sections of the application form.  It is speculated that the correction window might open anytime durin 2nd or 3rd weeks of October. So please keep an eye on the official website for more information.