[Xrystal]

Well with the following block of code I managed to get hold of your Guild Rep and XP and Events. But like you said access to the Calendar information seems to only trigger when you physically open the calendar. Then it carries out your code for the respective events.

XGIDB_Data is just my saved variables data for this test addon. Play about with it as you will. I only spent a couple of hours on it so may have missed some possibilities out.

local addonName, addonData = ...
 
local addonLoaded = false
local calendarLoaded = false
local guildLoaded = false
local calendarOpened = false
 
XGIDB_Data = {}
XGIDB_Data.index = 0
 
local function OnEvent(self,event,...)
    local args = { ... }
 
    print(event,...)
 
    XGIDB_Data.index = XGIDB_Data.index or 0
    XGIDB_Data.index = XGIDB_Data.index + 1
 
    XGIDB_Data[XGIDB_Data.index] = {}
    XGIDB_Data[XGIDB_Data.index][event] = {}
    XGIDB_Data[XGIDB_Data.index][event]["Arguments"] = {}
    for i,v in pairs(args) do
        tinsert(XGIDB_Data[XGIDB_Data.index][event]["Arguments"],v)
    end
 
    if ( event == "ADDON_LOADED" and args[1] == addonName) then
        if not IsAddOnLoaded("Blizzard_Calendar") then
            LoadAddOn("Blizzard_Calendar")
        end
        addonLoaded = true
    end
 
    if ( event == "ADDON_LOADED" and args[1] == "Blizzard_Calendar") then
        calendarLoaded = true
    end
 
    if ( event == "UPDATE_FACTION") then
        local numFactions = GetNumFactions()
        XGIDB_Data[XGIDB_Data.index]["Factions"] = {}
        XGIDB_Data[XGIDB_Data.index]["Factions"].Count = numFactions
        for index = 1,numFactions do
            local name, description, standingID, barMin, barMax, barValue, atWarWith, canToggleAtWar, isHeader, isCollapsed, hasRep, isWatched, isChild = GetFactionInfo(index)
            if ( name == "Guild" ) then
                XGIDB_Data[XGIDB_Data.index]["GuildRep"] = 
                {
                    description = description,
                    standing = standingID,
                    hasRep = hasRep,
                    value = barValue,
                    max = barMax,
                }
            end
        end
    end
 
    if ( event == "GUILD_ROSTER_UPDATE") then
        QueryGuildXP()
        QueryGuildEventLog()
    end
 
 
    if ( event == "GUILD_XP_UPDATE" ) then
        local currentXP, nextLevelXP, dailyXP, maxDailyXP, weeklyXP, totalXP, isUncapped = UnitGetGuildXP("player")
        XGIDB_Data[XGIDB_Data.index]["GuildXP"] =
        {
            CurrentXP = currentXP,
            DailyXP = dailyXP,
            WeeklyXP = weeklyXP,
            TotalXP = totalXP,
        }
    end
 
    if ( event == "GUILD_EVENT_LOG_UPDATE" ) then
        local numEvents = GetNumGuildEvents()
        XGIDB_Data[XGIDB_Data.index]["GuildEvents"] = {}
        XGIDB_Data[XGIDB_Data.index]["GuildEvents"]["Number of Events"] = numEvents
        for index = 1,numEvents do
            local type, player1, player2, rank, year, month, day, hour = GetGuildEventInfo(index)
            tinsert(XGIDB_Data[XGIDB_Data.index]["GuildEvents"],
            {
                Index = index,
                Type = type,
                Source = player1,
                Target = player2,
                Rank = rank,
                Year = year, 
                Month = month,
                Day = day,
                Hour = hour,
            }
            )
        end
    end
 
    if ( event == "PLAYER_GUILD_UPDATE") then
        if ( args[1] == "player" ) then
            GuildRoster()
        end
    end
 
    if ( event == "CALENDAR_UPDATE_GUILD_EVENTS") then
        local numEvents = CalendarGetNumGuildEvents()
        XGIDB_Data[XGIDB_Data.index]["GuildCalendarEvents"] = {}
        XGIDB_Data[XGIDB_Data.index]["GuildCalendarEvents"]["Number of Events"] = numEvents
        for index = 1,numEvents do
            local month, day, weekday, hour, minute, eventType, title, calendarType, textureName = CalendarGetGuildEventInfo(index)
            tinsert(XGIDB_Data[XGIDB_Data.index]["GuildCalendarEvents"],
            {
                Index = index,
                CalendarType = calendarType,
                EventType = eventType,
                Title = title,
                Month = month,
                Day = day,
                Hour = hour,
                Weekday = weekday,
            }
            )
        end
    end
 
    if ( event == "CALENDAR_UPDATE_EVENT_LIST") then
        local weekday,month,day,year = CalendarGetDate()
        local numEvents = CalendarGetNumDayEvents(0, day)
        XGIDB_Data[XGIDB_Data.index]["CalendarEvents"] = {}
        XGIDB_Data[XGIDB_Data.index]["CalendarEvents"]["Number of Events"] = numEvents
        for index = 1,numEvents do
            local title, hour, minute, calendarType, sequenceType, eventType, texture, modStatus, inviteStatus, invitedBy, difficulty, inviteType = CalendarGetDayEvent(0, day, index)
            tinsert(XGIDB_Data[XGIDB_Data.index]["CalendarEvents"],
            {
                Index = index,
                CalendarType = calendarType,
                EventType = eventType,
                Title = title,
                Month = month,
                Day = day,
                Hour = hour,
                Weekday = weekday,
            }
            )           
        end
    end
 
    if addonLoaded and calendarLoaded and not calendarOpened then
        local weekday,month,day,year = CalendarGetDate()
        local month, year, numDays, firstWeekday = CalendarGetMonth(0)
        CalendarSetAbsMonth(month,year)     
        OpenCalendar()
        calendarOpened = true
    end
 
end
 
local frame = CreateFrame("Frame","XGIFrame",UIParent)
frame:RegisterEvent("ADDON_LOADED")
frame:RegisterEvent("UPDATE_FACTION")
frame:RegisterEvent("PLAYER_GUILD_UPDATE")
frame:RegisterEvent("GUILD_ROSTER_UPDATE")
frame:RegisterEvent("GUILD_XP_UPDATE")
frame:RegisterEvent("GUILD_EVENT_LOG_UPDATE")
frame:RegisterEvent("CALENDAR_UPDATE_GUILD_EVENTS")
frame:RegisterEvent("CALENDAR_UPDATE_EVENT_LIST")
frame:SetScript("OnEvent",OnEvent)