Eoin– where did you travel from?
The good news is that Twisted Sister fans in Spain are just as friendly and as hospitable as SMF friends from other parts of the globe–I went to many of these shows alone, and found that I was able to communicate almost everywhere–and even with newly made friends who didn’t speak English, we all seemed to find to a way. Rock is a universal language. You might even try checking out both the TS facebook page and the Barcelona Rockfest facebook page to see if there are others from your homeland in attendance.
Good luck–hope to see you there!