I went to the open meeting with my husband today, as I do every Saturday, and this is the first time someone approached me afterward and told me that "the meeting is for alcoholics who have a desire to stop drinking, notice that the other 'al-anons' just passed when it came to their turn?"
Actually, it is up to each AA group. I have a regular meeting on Monday nights and anyone is allowed to share the 4th Monday of each month, our open meeting. We have a couple of alanons who come on an infrequent basis and they share.
It is decided in the business meeting of each AA group.
You could ask the meeting leader what the protocol of this particular group is: it will vary from group to group.