Hi,
I find there is a tricky discount which is hidden between the ABS and ELC events.
If you want to get that discount, register the ELC first. During the ELC registration pages, it will tell you if you also want to attend the ABS, the ticket price will be USD 150. The original ABS ticket price is USD 325. But there is no any discount information if you register ABS first.
So if you register the ABS first (like me, unfortunately), you will pay the full ticket price on both events.
I have sent an email to them to ask the refund but I'm not sure they will accept. I haven't received their feedback yet.
FYI.
BR
Botao Sun