I´ve mostly reached out to students & alumni via LinkedIn/Email or by personal connection if possible.
My experience was that people were very happy to talk about their experiences and tried to make time and give helpful advice were possible.
While I am not aware of an "official" channel, that doesn´t necessarily mean that there isn´t one.
I´ll try to keep this forum updated about my experiences at Sloan, although my personal experiences are of course highly subjective and the situation is going to be quite unique due to the ongoing pandemic.
Kind regards,
Chris