LoFi is LoFi... so not all features are available there...

Yes, thats right

And on my site only google use Lo-Fi.
Thats why I would prefer this
1. Registered Users only visible if you are logged in.
2. Message if you are not logged in.
But u can put a message, like "There is a event on this topic"
Same on Lo-Fi and on normal version.
But you are the man MG... you could decide
