Also are events like guidance reports scheduled or do they just happen randomly? Let me give an example. Today Dycom (DY) stocks just plunged due to a change in their outlook (outlook for adjusted earnings per share was cut to $1.05 to $1.08 from $1.13 to $1.28). So are these events planned so that you as a trader know when there will be a revision or do the revisions just happen. I know the quarterly reports are planned but not sure about revisions like this. Sorry I'm a newbie just learning this stuff.