I think it does have a influence, but it only reflect in the data, a month before the event and then a month after the event.
This is why we see a dip in the price in January and slow recovery in the price, from March to the end of the year. ^hmmmm^
Yeah its not the event that matters but the way market react because of those events, like in Christmas people tend to sell their coins because they need to buy gifts or preparation for many parties that they will going to attend or host. Because as people continue converting their bitcoin, the demand decreases and so the value drops