One way to invite friends to HDChina is that you donate. There are options on HDChina's donation page, you can buy an invite, about 30 USD/invite. It's an official invite from HDChina, that means you don't need to care whether HDChina invites system invite closed or not. Every HDChina user can buy that invite.

So the only way to get into HDChina now is that you have a friend from HDChina and he is willing to invite you by buying an invite from HDChina donation page.

I have seen a topic asking for an invite to HDChina but it was closed, the reason: invite system closed. You see, there's a way by mean of donation. All you need is that who will make that donation and invite you. LOL

P/S: I hope this will help someone looking for an invite to HDChina during invite system closed period. You can still wait until the invite system is open.