Will this project make twice as much us dollars if the price of bitcoin doubles? Because that's what you'll need to do if the statement in your title is correct.
With this kind of ventures you have to forget about Bitcoin valuation as it is just an investment vehicle. It is a business thought for the fiat world and returns will be in fiat (maybe converted to BTC at the time of payment). You have to decide if you would rather hold the BTC expecting a higher return than the investment in the proposed timeframe.
Subject: "Looking for investment of ~2500 BTC for music festival, return = ~150,000"
Sure bitcoin price matters, since OP is "investing" bitcoin into fiat, and then converting fiat profits (sorry if you just sprayed your keyboard with coffee) into bitcoin. If, at the time of repayment (moar lulz, sorry) bitcoin price has doubled, OP would need double the fiat to cover it.
I'm amazed that you read OP's business proposal, concluded that it is sound, and missed this glaring blunder.
.. If I compare this to the projects some people have been throwing tons of cash into lately which hardly had any business plan at all or they lacked basic financials (like NEO-BEE recently)...
NeoBee was a bag of dicks. This is a cheaper bag of dicks, but the dicks it contains are just as suckulent and tasty.
Do.not.want.