It looks empty and sad . What's the next thing ? They do well at that venue!
The venue has its own history;
https://en.wikipedia.org/wiki/Roald_Dahl_Plass
It does make a wonderful outside event venue. At the lower end the lock gates that retained the water and allowed large ships to sail right up the the city centre.

Here is Roald Dahl Plass or as then, The Oval Basin;
To the right of the Oval Basin you can see a rectangler basin, that has been filled in and is now the location of The Senedd, the Welsh Assembly building;
A £70 million showpiece. https://en.wikipedia.org/wiki/Senedd
Above and slightly to the left of the Oval Basin is the water way that allowed ships to sail to the city centre, that has also been filled in and reclaimed, now known as Lloyd George Avenue.

Now a major road that delivers vehicular traffic from the Bay to the city centre.