In .cz, the universities are either completely open, or there are turnstiles/card entry which is possible to easily social-engineer[1]. The lectures are open an

In .cz, the universities are either completely open, or there are turnstiles/card entry which is possible to easily social-engineer[1]. The lectures are open and nobody asks if you actually study there (this would be even practically impossible with mass courses). The practicals/seminaries depend on particular tutor, but visitors are generally tolerated (sometimes even welcomed). In practicals where some material or resource is consumed (biology labs, welding tutorials) it's of course a different case. I was visiting university lectures while at high-school, and then I did some totally out-of-curriculum courses when at the university. (speaking of https://www.mff.cuni.cz/en https://www.mff.cuni.cz/en, https://www.natur.cuni.cz/eng https://www.natur.cuni.cz/eng and https://fel.cvut.cz/en/ https://fel.cvut.cz/en/, YMMV) [1] Just say "I go to lecture XYZ", or slip with someone thru, or the best strategy is probably to lie about forgetting the card at home (nobody checks it), as "I go to lecture XYZ but I don't actually study here" spawns weird conversations with the watchman. For example, at some buildings the card entry was installed only to prevent the tourists using the university toilets :) and the security is instructed to let in anyone who looks like a genuine attendant.