I just found out about it accidentally on the https://www.serimats.org/ website. I applied to the program but did not get any notification about the extended deadline. Either I made a typo in my email address (in that case can organizers please correct it if they choose to invite me, it should be email@example.com?) or the organizers did not notify the applicants. In case it's the latter, I just wanted to let all of you who applied know that you have another day to try and improve on your first submission.