How far are you from Budapest?
Approximately 100 km.
Google it and it will show you what it is like now.
I looked it up. I do not even remember that they have an event hall. The aquarium itself seems to be the same. I have not found a photo about the entrance, so I currently do not know what that is like nowadays. Either way, it is an exciting and/or calming place, depending on what you like. We have not had aquarium at home, but if I saw one somewhere with fish, it always gave me a calm and relaxed feeling. I remember seeing the swimming fish in an aquarium in a room a few year.
Have a great night!
Have a nice day and have a nice weekend. All the best. Greetings and much love from Hungary.