Hello ArainMorn!
Thanks for your interest and faith in this fresh convention!
Lets get to answers:
1) From the ticket system, we do see quite few foreign visitors from surrounding countries - however, since English language is primary language of the entire convention, its quite safe to assume that attendees will be able to communicate to a degree. Regarding the hotel/hostel - thats a tough one as we don't have data access on that one
2) Funnily enough, I've prepared Cosplay contest sign-up form today and am working on the rule-part (which will be simple as we want to keep things nice and easy for the start)!
3) Prague's airport (Letiste Vaclava Havla - used to be Ruzyne, renamed post-mortum in honor of our ex-president) has everything in English and there are English info booths as well - the whole of Friday is filled with organized city-wide LARP event (again, in English), Saturday is filled up to the top while Sunday is more chilled out.
Possibly this Thursday we will have a big announcement on a new guest that we will be flying in - will update all PR sites about that. However, most of the team is leaving for Galacon thus the cosplay info will have to wait for Tuesday. The Program itself is almost ready and we are getting close with the Saturday's after party announcement too!