What can you expect from the IEM Cologne 2026 Stage 3?

My brother and I want to watch a CS Major live. We only have time on Saturdays and didn't get tickets for the semi-finals, so I bought two of those for stage 3. But what is this actually? Will we just watch a screen like in the cinema? Is there live commentary? I know the swiss system from chess, many games at the same time. Which will be transmitted? Did I just waste 160€? (again, after buying a knive skin two weeks ago)