Conference ``Low-dimensional varieties in positive characteristic" on characteristic geometry.

Amsterdam, 1998

C. Faber, G. van der Geer.

Amsterdam Summer Workshop ``String Theory and Black Holes"

Amsterdam, July 6-24, 1998

R. Dijkgraaf

First Dutch Spring School on Mathematical Physics

Nijmegen, March 8-12, 1999

R. Dijkgraaf, N.P. Landsman

Third Texel Conference: Moduli of Abelian varieties

Texel, April 25-29, 1999

C. Faber, G. van der Geer

Amsterdam Summer Workshop ``String Theory, Gauge Theory and Gravity"

Amsterdam, July 5-17, 1999

R. Dijkgraaf

Workshop ``Non-Commutative Gauge Theory''

Leiden, November 22-26, 1999

J. de Boer, R. Dijkgraaf