On part
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The on PART events trigger when a user parts a channel.
on <level>:PART:<#[,#]>:<commands>
The part message is saved in $1-.
Note that this event also triggers when you part a channel.
Example
on *:PART:#: { echo $chan $nick has just parted $chan (reason: $1- $+ ). }
This example reacts on every part in a channel you are in and echos it to this channel.
on me:*:PART:#: { echo -s I have just parted $chan }
This example will react on you parting a channel and echo it to your Status Window. Note that is no mistake, the prefix is "me:".
See Also
To react on joins, take a look at the On join event.
The On quit event is triggered when someone quits IRC.