Here's the perspective of an ALO (me).
If your son or daughter is a candidate and is checking their portal daily and they suddenly see an "Evaluator ALO" listed, have them contact that ALO ASAP. A proactive e-mail is fine. If they want to send a little personal information to the evaluator, fine. But showing interest and attention to detail by being quick and ready...that goes a LONG way.
I will usually wait two weeks...if I don't hear from the candidate by then, I will reach out.
Steve
USAFA ALO
USAFA '83