March
7th,
2019

For this challenge we have to find a live stream of s7a73farm, to find the flag. From the description we know that it was a live streamed before the CTF.
Some google and here is his stream page : Link

So it must be in the last one : Link
And yes we can have the flag at 33:34 :

The flag :
flag{H0p3_y0u_R3g!5t3r}