Photo 1 | Photo 2) via danieljradcliffe.tk's Twitter with thanks to Paul Zimmerman for sharing his photos. There are also photos of him signing autographs outside. There isn't a video available as far as I know now, but if there is I'll update this post.
Update: Via Josh Horowitz's Instagram
Update: 1st July 2016. Podcast plus video available via iTunes.
SWISS ARMY MAN selfie by Paul Dano. Fun event last night w/Paul & Daniel Radcliffe. #swissarmyman #danielradcliffe #pauldanoAnd a new Happy/Sad/Confused photo
picture source: Steve Zak, Jamie McCarthy