My RPG had ~3,600 events. It was my first game, a lot of repetitive code since back then, the function plugin wasn't standard with C2, its a separate plugin.
My current game, a sandbox space RTS, is not finished and its at ~3,500 events. With a lot of function usage too for repetitive stuff.
These are games for mobiles too, there's no need to worry about events (when used correctly) being the cause of performance issues.