Our guild has a meeting ambassador who introduces new members to other members before the meeting and during the break. It's a large guild, so new members can go unnoticed otherwise.
I agree that it's important to make new members (and visitors) feel welcome and to involve them in guild activities. However I also understand that many people go to the meeting specifically to see their friends and catch up with them. Trying to break up these groups of friends during the meetings can backfire and make everyone unhappy.