QG group meeting: twistors, massless fields and higher-spin algebra

This is the weekly Quantum Gravity group meeting.
Speaker: Yasha Neiman
Title: "Twistor geometry, Penrose transform and higher-spin algebra in (A)dS_4".

I (Yasha) am experimenting with the mechanism for advertising these.
If we end up advertised in the wrong place, I'm sorry (though not terribly).