Not sure which aspect of application security (fuzzing, web etc) you are interested in so I will list a few.
Infosec in the City
https://www.infosec-city.com/sg18-t-bug-hunting-millionaire (22-23 May 2018)
HITB GSEC 2018
https://gsec.hitb.org/sg2018/sessions/3-day-training-3-source-code-auditing-like-a-ninja/ (August 27, 2018 onwards)
https://gsec.hitb.org/sg2018/sessions/3-day-training-5-pentesting-the-modern-application-stack/
https://gsec.hitb.org/sg2018/sessions/3-day-training-6-mastering-burp-suite-pro-100-hands-on/
If you want some application security resources, you can check out
https://github.com/paragonie/awesome-appsec
Do CSSLP at NUS.Uppppp......
Do CSSLP at NUS.
Go for oswe