I. Suprunenko: The behaviour of unipotent elements in modular

Naturally, I can speak only about my talks though some of the materials I recommend would be useful for preparation to some talks of other speakers as well.

I would recommend the following.

1. R. Steinberg, Lectures on Chevalley groups, Yale Univ. Math.Dept., 1968.

2. J.E. Humphreys, Linear algebraic groups, Springer, New York, 1975.

3. J.E. Humphreys, Modular representations of finite groups of Lie type, London Math. Soc. Lect. Note Ser., 326, 2006 (sections devoted to algebraic groups and restrictions of representations from algebraic groups to finite Chevalley groups).

4. G. Seitz, Topics in the theory of algebraic groups (Lausanne lectures), http://darkwing.uoregon.edu/~seitz/Lausanne.pdf (these lectures are published, but I cannot find the reference to the paper version now).

5. M.E. Liebeck and G. Seitz, Unipotent and nilpotent classes in simple algebraic groups and Lie algebras, http://darkwing.uoregon.edu/~seitz/unipswap(41107).pdf (preprint, all references to this article I have seen refer to a preprint).

6. J.C. Jantzen, Representations of algebraic groups, Second edition, Math. Surveys and Monographs, Vol. 107, AMS, 2003, P. II, Chapter 2 (for some advanced participants).