Type "/framescan" or "/fs" and the frame name to get a list of all(known) events and handlers registered to the frame or provide a 2nd argument and it will return only those registered events that match your passed argument like CHAT would scan for
BN_CHAT_MSG_ADDON,
CHAT_MSG_ACHIEVEMENT
CHAT_MSG_ADDON
CHAT_MSG_BG_SYSTEM_HORDE
CHAT_MSG_BG_SYSTEM_NEUTRAL
CHAT_MSG_CHANNEL
CHAT_MSG_CHANNEL_LEAVE
CHAT_MSG_CHANNEL_NOTICE_USER
CHAT_MSG_COMBAT_XP_GAIN
and many more (116 total)
PLAYER = 72 matches
RAID = 14 matches
And so on...