This is actually really helpful to flag in this because I had never thought of sending slides in advances as an accessibility need, per se. I honestly viewed it more as a convenience or perk for guests, which reflects the fact that I never actually stopped to think how big a difference this must make to anyone who has any accessibility request whatsoever – not just from a audiovisual accessibility standpoint or an IT standpoint, but also, for those who might face language barriers (which is ESPECIALLY significant in the sciences because I've spoken to many researchers who grew up with a non-English language as their primary language, who then went on to study in an English speaking country, and were later invited back to present in a country that speaks their primary language and they realized they had to basically learn all the terminology in what is otherwise their primary language. In other words, it's not even just a help to those whose primary language may not be English, rather, anyone who is multilingual (or, of course, anyone who is less familiar with science terminology) may not necessarily follow any science terms, etc. referenced as easily, so having slides in advance could help bridge this communication gap.