[suicidalkatt]

You want to check that the event passed is equal to the name of the event:

local oEvents = { -- These are events that we can check for
    "GOSSIP_SHOW",
    "BANKFRAME_OPENED",
    "GUILDBANKFRAME_OPENED"
}
 
if oEvents[event] then -- The 'event' is passed from the OnEvent script within kgPanels
    ChatFrame1:Hide()
    ChatFrame3:Hide()
    ChatFrame1ButtonFrame:Hide()
    ChatFrame3ButtonFrame:Hide()
    ChatFrameMenuButton:Hide()
    GeneralDockManager:Hide()
    FriendsMicroButton:Hide()
else
    ChatFrame1:Show()
    ChatFrame3:Show()
    ChatFrame1ButtonFrame:Show()
    ChatFrame3ButtonFrame:Show()
    ChatFrameMenuButton:Show()
    GeneralDockManager:Show()
    FriendsMicroButton:Show()
end