Amir-Kian Kashani-Poor

Rencontres théoriciennes: bimonthly Paris wide seminars on string theory and related topics
Joint LPTENS/LPTHE seminars: joint strings seminar series between ENS and Jussieu
Seminaires Darboux: seminars by mathematicians for physicists, see also here
Ashoke Sen, D-instanton corrections to string amplitudes. Part 1 Part 2 Part 3 Notes