If you want to increase the probability over all eras its easier to
copy program files\firaxis games\sid meier's civilization 4\beyond the sword\assets\xml\globaldefines.xml
to
\my games\beyond the sword\custom assets\xml\globaldefines.xml
open that file using any texteditor.
It has a tag
<DefineName>EVENT_PROBABILITY_ROLL_SIDES</DefineName>
<iDefineIntVal>100</iDefineIntVal>
Decreasing this value increases the probability of events - be carefule not to use a value smaller than the highest <iEventChancePerTurn> from above.
有没有办法只针对特定玩家修改随机事件总的发生的频率呢？

有人么？对方动不动马拉松 GOLDEN AGE受不了

没有可能，随机事件是全局变量，对所有玩家生效。黄金时代那是人家拿伟人烧的，不是随机事件吧？