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Events that cause major movement in forex?
Look for unsustainable policies and actions by policy makers, both before and possibly during, when looking at the ForEx markets.  Consider some examples: Each of those events could be seen in the growing unsustainability of local policies.  ForEx markets and local policies can appear to stay on an unsustainable path for a long time, but equilibrium will force itself on everything in the long run.  In two of the above cases, the initial response wasn't enough to offset the mess, and more and more intervention had to be done, only making matters worse.  When you know how unsustainable policies are and how big the corrections need to be, you can quickly ascertain whether an action by policy makers will be enough.