Lewis on Grace

JohnHale · Junior Joined: 23 Apr 2018 Posts: 9

Hi,

I have been reading Philip Yancy's 'What's so Amazing about Grace?' It tells a story along the following lines:
During a conference on comparative religions, C.S.Lewis walked into a protracted debate on what, if any, belief was unique to the Christian faith. The assembled experts had gradually eliminated various possibilities. Lewis who was passing came in to find out what all the noise was about. On hearing the topic for debate C.S.Lewis said, "Oh that's easy. It's grace."
Yancy gives a reference for this but the whole thing feels apocryphal to me. What was Lewis doing at this conference? Was he invited? If not how did he come to be strolling past? Did people even hold conferences on comparative religion in Lewis's day?
What do people reckon? Did this really happen?

Any help will be apprecited.

I didn't find the right solution from the Internet.

References:
http://cslewis.drzeus.net/forums/viewtopic.php?t=10150
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Thank you.