I would recommend just telling him how you feel. I know, that's crazy and old fashioned but whatever. Try it and he may invite you to come along with him as a date and you won't have to stalk him...just a thought (didn't mean that as sarcasm). Or, if you really insist on keeping things complicated, tell him that you would like to go to the festival with him but don't have any money. He may loan some to you or offer to simply pay your way (while his choice there MAY indicate something, I wouldn't read too much into it). This way, you both can have a shared experience, talk, and then...I don't know...you could tell him how you feel. By "tell him how you feel", I wouldn't mention the whole "I want to stalk you" bit. Just leave it at "I think you're really attractive and interesting and I'd like it if we would become more than just friends"...but in your own words.
Also, DO NOT sit outside his doorstep or stalk him. Seriously, do you want a relationship with this guy or a restraining order? Again, I'm not trying to make fun. That's just how I make my points clear, by being direct...they sometimes come across as comedic or satire. Anyways, so yeah, show interest but NOT psycho stalker interest. Like Cerebus23 said, you may want to seek counselling if these thoughts persist so they don't ruin your life. That's even if you don't feel you have a serious problem. I mean, you came here asking for our help and opinions, maybe it would be of assistance to ask someone who has been trained in the best ways to help people. There's no shame in that, I've done it and many others have too. (Though considering the no $ thing, I would recommend you talk to someone who doesn't charge, like a spiritual leader or something. Also, there may be free counselling available in your community). Sometimes you just need someone to talk to. This can and will destroy your life if you let it, the same way that drugs and alcohol do.
So, yeah, that's my advice. Take it or leave it. I hope that everything works out for the best.
By the way, I didn't realize that you were a male when I wrote the above. I mean, I don't care, whatever makes you happy. The only thing is, if he is straight and not interested DON'T push the subject. There was the gay guy who kinda stalked me for a while after I made it clear that I had no interest in him whatsoever and it almost ended in a fight (when he decided to grope on me)...except I have self control and couldn't afford to be fired. So, yeah. If he's not interested, back off. I mean, that's kinda important anyways. I'd rather you not ruin your friendship over this or possibly get injured. The guy who groped me had just gotten out of the hospital for getting beaten up by someone who took offense to his flirts.