In preparation for these GAP Days please get your resources up to date. Please note that this list will be updated on the go, as we find more things that need to be prepared.
get/check access to the gap-system slack, in which there is a dedicated GAP Days channel. If you do not have access to this slack please email us and we will invite you.
you probably should have a recent version of GAP installed (4.11 or a development version built from the master branch)
if you are interested in OSCAR or the GAP-Julia integration, perhaps also install Julia (and OSCAR) beforehand; see https://oscar.computeralgebra.de/install/ for hints how to do that (in fact this will also give you a GAP installation)