I have tested with Children's Week etc "HC" in some quests. An error

Date: 2019-10-12 08:56:23
ID: 1
Error occured in: Global
Count: 1
Message: ..\AddOns\Grail\Grail.lua line 3825:
attempt to call local 'CalendarGetNumDayEvents' (a nil value)
Debug:
Grail\Grail.lua:3825: CelebratingHoliday()
Grail\Grail.lua:7507:
Grail\Grail.lua:7466
(tail call): ?
Grail\Grail.lua:9856: StatusCode()
Grail\Grail.lua:4016: ClassificationOfQuestCode()
Wholly\Wholly.lua:1509: _ClassifyQuestsInMap()
Wholly\Wholly.lua:1949: _ForcePanelMapArea()
Wholly\Wholly.lua:4280: UpdateQuestCaches()
Wholly\Wholly.lua:1040: ?()
Wholly\Wholly.lua:2591: _OnEvent()
Wholly\Wholly.lua:4296:
Wholly\Wholly.lua:4296
Locals:
self =

{
QuestBreadcrumbsFor = defined @interface\AddOns\Grail\Grail.lua:8694
bitMaskClassPriest = 256
IsBugged = defined @interface\AddOns\Grail\Grail.lua:6716
bitMaskGenderMale = 8192
_RecordArtifactLevels = defined @interface\AddOns\Grail\Grail.lua:9269
bitMaskCompleted = 1
_PrepareWorldQuestSelfNewNPCs = defined @interface\AddOns\Grail\Grail.lua:3226
QuestLocationsAccept = defined @interface\AddOns\Grail\Grail.lua:8852
IsAvailable = defined @interface\AddOns\Grail\Grail.lua:6698
NO_SKILL = -1
_HandleEventGarrisonBuildingActivated = defined @interface\AddOns\Grail\Grail.lua:6403
bitMaskClassAll = 268443644
_HandleEventLootClosed = defined @interface\AddOns\Grail\Grail.lua:6431
bitMaskQuestLegendary = 4096
_RemoveDelayedNotification = defined @interface\AddOns\Grail\Grail.lua:4872
reputationFriends = {
}
NPC_TYPE_BY = "BY"
NPC_TYPE_DROP = "DROP"
_PostDelayedNotification = defined @interface\AddOns\Grail\Grail.lua:8071
_MarkQuestType = defined @interface\AddOns\Grail\Grail.lua:5232
receivedCalendarUpdateEventList = false
bitMaskClassDeathKnight = 4
QuestNPCPrerequisiteTurnins = defined @interface\AddOns\Grail\Grail.lua:9023
_ProcessServerBackup = defined @interface\AddOns\Grail\Grail.lua:8383
bitMaskQuestVariableLevel = 4278190080
MeetsRequirementGroup = defined @interface\AddOns\Grail\Grail.lua:7668
_EvaluateCodeAsPrerequisite = defined @interface\AddOns\Grail\Grail.lua:5746
bitMaskInLog = 16
bitMaskQuestWeekly = 4
bitMaskHolidayNoble = 256
MeetsRequirementProfession = defined @interface\AddOns\Grail\Grail.lua:7753
DoesNPCExist = defined @interface\AddOns\Grail\Grail.lua:5711
npcNames = {
}
_AllEvaluateTrueS = defined @interface\AddOns\Grail\Grail.lua:3519
bitMaskQuestFailureWithAncestor = 67043200
verifyTable = {
}
_NPCToUse = defined @interface\AddOns\Grail\Grail.lua:7936
garrisonBuildingLevelMapping = {
}
bitMaskClassHunter = 16
_LoadContinentData = defined @interface\AddOns\Grail\Grail.lua:3054
bitMaskQuestRaid = 128
_LocationStructure = defined @interface\AddOns\Grail\Grail.lua:7253
_HandleEventAchievementEarned = defined @interface\AddOns\Grail\Grail.lua:6398
checksReputationRewardsOnAcceptance = true
classToMapAreaMapping = {
}
verifyTableCount = 0
playerGenderBitMask = 16384
_ReputationExceeds = defined @interface\AddOns\Grail\Grail.lua:9457
bitMaskRaceUnused9 = 4096
zonesForLootingTreasure = {
}
bitMaskQuestMonthly = 8
mapAreaBaseClass = 200000
exists73 = false
LearnObjectName = defined @interface\AddOns\Grail\Grail.lua:7179
_ContainsAliasNPC = defined @interface\AddOns\Grail\Grail.lua:5453
classToBitMapping = {
}
FriendshipReputationNameAndLevelName = defined @interface\AddOns\Grail\Grail.lua:9556
QuestBreadcrumbs = defined @interface\AddOns\Grail\Grail.lua:8688
NPCName = defined @interface\AddOns\Grail\Grail.lua:7891
experimental = false
bitMaskRaceNightborne = 2
mapAreaBaseReputation = 400000
UnregisterObserverQuestStatus = defined @interface\AddOns\Grail\Grail.lua:10103
tooltipNPC = com_mithrandir_grailTooltipNPC {
}
QuestOnAcceptCompletes = defined @interface\AddOns\Grail\Grail.lua:9035
bitMaskAncestorLevelTooHigh = 33554432
bitMaskRaceTroll = 16777216
bitMaskCanGetUnused2 = 65536
_IntegerFromStringPosition = defined @interface\AddOns\Grail\Grail.lua:5287
bitMaskQuestMinLevel = 65280
bitMaskLevelTooHigh = 32768
IsGroup = defined @interface\AddOns\Grail\Grail.lua:6750
bitMaskCanGetUnused8 = 4194304
bitMaskCanGetUnused15 = 1073741824
MeetsRequirementGroupPossibleToComplete = defined @interface\AddOns\Grail\Grail.lua:7696
questReputations = {
}
versionNumber = 102
_ProcessQuestsForHandlers = <fu
AddOns:
MoncaiCompare, v7.2.0
Swatter, v8.2.6377 (SwimmingSeadragon)
AdvancedInterfaceOptions, v1.3.3
AucAdvanced, v8.2.6430 (SwimmingSeadragon)
auccheapsearcher, v20190917r3
AucFilterBasic, v8.2.6364 (SwimmingSeadragon)
AucStatHistogram, v8.2.6366 (SwimmingSeadragon)
AucStatiLevel, v8.2.6370 (SwimmingSeadragon)
AucStatPurchased, v8.2.6367 (SwimmingSeadragon)
AucStatSimple, v8.2.6399 (SwimmingSeadragon)
AucStatStdDev, v8.2.6369 (SwimmingSeadragon)
AucUtilFixAH, v8.2.6371 (SwimmingSeadragon)
BadBoy, vv1-classic
BadBoyCCleaner, vv8.2.0
BadBoyGuilded, vv8.2.0
BasicChatMods, vv2-classic
BeanCounter, v8.2.6422 (SwimmingSeadragon)
BetterVendorPrice, vv1.09.01
ClassicCastbars, vv1.0.6
ClassicCastbarsOptions, v
ClassicSpellActivations, v
ClassTrainerPlus, v0.5-beta
CTBarMod, v8.2.5.3
CTBuffMod, v8.2.5.2
CTCore, v8.2.5.2
CTLibrary, v8.2.5.1
CTMailMod, v8.2.0.8
CTMapMod, v8.2.5.2
CTPartyBuffs, v8.2.0.1
CTUnitFrames, v8.2.5.2
Enchantrix, v8.2.6428 (SwimmingSeadragon)
ExtVendorUIClassic, v1.0.4
GatherMate2, v1.45.4
Grail, v102
GrailNPCsclassic, v27178
GrailNPCsclassicenUS, v27178
GrailQuestsclassic, v27178
GrailQuestsclassicenUS, v29297
GrailReputationsclassic, v007
GrailWhen, v002
GSE, v2.4.21
GSEGUI, v2.4.21
GSELDB, v2.4.21
Informant, v8.2.6374 (SwimmingSeadragon)
LetMeCast, v1.3
MageButtons, v1.0
Mapster, v1.8.5
Misspelled, v1.7.4
MonkeyBuddy, v
MonkeyLibrary, v
MonkeyQuest, v
MonkeyQuestLog, v
OmniCC, v8.2.4
QuestFrameFixer, v1.1.1
QuestIconDesaturation, v3.1
Questie, v4.1.1 BETA
QuestLogEx, v1.2
SlideBar, v8.2.6375 (SwimmingSeadragon)
Stubby, v8.2.6376 (SwimmingSeadragon)
TFTB, v1.10
TitanClassic, v1.1.0.11302
TitanClassicAmmo, v1.1.0.11302
TitanClassicBag, v1.1.0.11302
TitanClassicClock, v1.1.0.11302
TitanClassicGold, v1.1.0.11302
TitanClassicLocation, v1.1.0.11302
TitanClassicLootType, v1.1.0.11302
TitanClassicPerformance, v1.1.0.11302
TitanClassicRegen, v1.1.0.11302
TitanClassicRepair, v1.1.0.11302
TitanClassicVolume, v1.1.0.11302
TitanClassicXP, v1.1.0.11302
WhatsTraining, v1.8.4
Wholly, v074
BlizRuntimeLib_enUS v1.13.2.11302
(ck=8a0)

I assume we will have the holidays in Classic sometime.

Yes, Kinda guessed that. As a suggestion, a page on Wholly to mark them on or off? I realise that this is decidedly inelegant.

If possible, could you have quests with a holiday be blocked from display, until you find a way to block them. If it's not too much extra.