The word ‘akce’ does mean ‘action’ in English but we do not use it for organised events. Action is a movement like waving your hand, or the word a director shouts when the filming starts.
For organised meetings, we use the word ‘event’. This can be for conferences, festivals, parties or anything organised where people come together.
We also have the adjective ‘eventful’, a word we use to say that lots of things happened, often dramatic.
Here’s a short conversation to demonstrate:
A: How was that music event you organised last week?
B: It was great but it was certainly eventful – the band arrived 2 hours late, two people had to go to hospital and the police were called after a fight!
