Normal rules apply. Quiet kids and food that is quiet and not too aromatic are not disruptive. Loud kids and stinky food are disruptive. Let that be your guide.
As for the meetings, there are far more alcoholics looking for AA meetings than there are Alanonics looking for Alanon meetings. I know somebody who started a Wednesday meeting from 5:30 to 6:30 themselves because it worked for their schedule. It turns out it worked for a lot of other people's schedules too.
P.s. Speaker meetings are where one person shares the whole time (sometimes two). They can be pretty awesome. I almost always find them compelling. I've been bored out of my mind, too, but rarely.
Take care,
Cyranoak