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Unless you store the value in the contract then you will have to loop over all events. That being said you would have to have a pretty full node to keep a log of all events ever (normally logs a pruned from nodes when they get too old).

What might be a simpler solution (gas costs not withstanding) would be to store the max value in your contract. // store the max val uint maxVal = 0;

// an event to notify that val has changed
event ValChange(uint _val);

function storeValue(uint _val) {
  // store biggest _val
  if (_val > maxVal) {
     maxVal = _val;
  }
  // trigger event
  ValChange(_val);
}