previous years, Batu Caves play host to thousands, mostly devotees although tourists with cameras and camcorders make up a good percentage of the teeming crowd. The weather is great today (as in no rain with mild sunshine) for a visit to this once-a-year event though you would have to put up with the crowd (everywhere you turn), the sights (kavadi-carriers) and smells (of food, flowers and incense) of such a gargantuan event. Frankly, this could be a once-a-lifetime kind of experience.
However, if you are not participating and do not want to be caught in the horrendous traffic jam, stay away from the Gombak/Sentul area or anywhere near Batu Caves.
If you are heading there anyway and need help with its location, this map may be useful.
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Image source: Wikipedia