As with so many of these marketing texts, there's lots of ways to handle this, but here's my shot (before my morning cup of tea, so I might come back and edit it!) to get the ball rolling.

In fact, I'd turn the sentence round altogether, and have something like: "The trade fair has become/is becoming [depending on what's going on in the surrounding sentences] even more appealing and relevant thanks to..."

I'd certainly suggest using "appealing" instead of "attractive" for "attraktiv" (/"Attraktivitaet") - it's often a slight false friend here, in my view!