ASEAN-Japan Music Festival 2019 in VIETNAM won't be broadcast live, only next month:
The music festival will be aired by VTV at 20:10 on August 11. https://english.vov.vn/culture/asean...nam-400733.vov
---
Edit:
It seems like she performed already:
https://twitter.com/Haru277/status/1155472579055853568
Two more pics from the performance:
https://baomoi.com/dai-nhac-hoi-asea...c/31631489.epi
It looks like a ballad + Eh Yo. So I guess it was Ai no Uta + Eh Yo.