Many thanks to @VDuponchelle for sharing her photo of Keanu from the reception on twitter.
Many thanks to @gwenreznoreeves for sharing her photos from the event on twitter.
Note: Ms. Duponchelle is an editor at Le Figaro. She posted an article on the sale of the painting and how it impacts Basel. While it is sad news it did not impact the luncheon that was held on Saturday afternoon. The photo that she tweeted above appeared in that article.
Update X2: Many thanks to Collecting Autographs Via Venue for sharing a photo on FB and to @keanulatino for tweeting the link!