There is (I just checked the maps on ), but it looks like it's really unpractical, you would have to change buses in the center of the city, and because of that detour, the trip will most likely be long... plus one of the two buses doesn't run after 9pm
However you will surely not be the only one going to the Stunfest and staying at that hotel. I'm quite sure you should be able to find someone to drive you between the Stunfest and this hotel.
I will probably (...most likely?) stay at that hotel for example

But I might not be the best choice to drive you, as I will be giving a hand on the event and will most likely not have the same schedule as players
I understand you're short on money but if you're on foot and you don't want to bet your hosting on the chance of finding someone to drive you, I think your best choice is the , just a few hundred meters from the festival, but starting at €62/night

Or wait/hope for someone to answer this thread (thread that I should stop hijacking with hotels

)