Just recently I highlighted three videos from the C. S. Lewis Symposium that was held on 11/21/13. There are actually a couple of other resources related to this that I wanted to make sure you were aware of. One is a single audio file featuring highlights from the actual memorial service from the following day. The other is a video of Dr. William Lane Craig when he spoke at the C.S. Lewis Oxford Society last year.
1. Audio Highlights of Memorial Service from 11/22/13 (Click to listen to audio)
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2. Dr. William Lane Craig at C.S. Lewis Oxford Society