fair use cases permitting use of text and you will see that using more than a few hundred words is usually difficult to justify as a fair use.
But the professor is on your side. Because the professor/author favors your use, you probably won't have problems. As we discussed in a recent post, the author may have the right to permit copying. But even if the author doesn't possess that right, the publisher might not want to get into a dustup, particularly if you limit the reproduction to the 10-20 people who will actually attend the meeting ... er, meetup.