I am interested in knowing what kind of events and news have a direct impact on the bitcoin prices besides the raw supply and demand.
"The price" is established through supply and demand, by definition.
Speculators might temporarily skew supply or demand after reading some news or predicting/anticipating some event. Or simply by rumours and herd mentality (more often than not).
What those speculators react to you'd have to ask them and doesn't sound like an on topic question here. It's not related to Bitcoin anyway, as it's the same for any other market.
One likely upcoming drop in supply is coming around 2016-07-26 when the block reward is going to halve again.
There has been a burgeoning stream of academic papers that study the impact of different kinds of factors on the exchange rate of Bitcoin (primarily BTC against USD).
One of the best studies that I suggest you look at is "What are the main drivers of the Bitcoin price?" by Kristoufek (2014).
There the author implements a wavelet coherence analysis to assess the impact of a big set of economic, transaction, technical and interest-related factors.