The IEventManager is what you're gonna need when dealing with event handlers.

It might be required for you to import the class if you encounter any issues.
import crafttweaker.events.IEventManager;

You can access the event manager using the global events field

You can add a function that represents the event and from there on you can decide what you want CrT to do if such an event occurs.
The most important thing to remember is that you need to CAST THE EVENT TO IT'S TYPE! as otherwise you will not be able to access any if it's ZenGetters.
If you simply want to print something where you don't need to access the event, then it's fine.

ZenScript
 Copy
events.onPlayerCrafted(function(event as crafttweaker.event.PlayerCraftedEvent){
    print("event".length);
	print(event.player.name);
	event.player.xp += 1;
});


events.onPlayerLoggedIn(function(event) {
	//event instanceof Object -> No way of accessing it, so better cast!
	print("SOMEONE HAS LOGGED IN!!!");
});

The ZenMethods would be what you'll need to call on events, the Event Class would be what you need to cast the event as.

ZenMethod	Event Class
ZenMethod onAllowDespawn	Event Class crafttweaker.event.EntityLivingSpawnEvent
ZenMethod onAnimalTame	Event Class crafttweaker.event.AnimalTameEvent
ZenMethod onArrowLoose	Event Class crafttweaker.event.ArrowLooseEvent
ZenMethod onArrowNock	Event Class crafttweaker.event.ArrowNockEvent
ZenMethod onBlockBreak	Event Class crafttweaker.event.BlockBreakEvent
ZenMethod onBlockHarvestDrops	Event Class crafttweaker.event.BlockHarvestDrops
ZenMethod onBlockNeighborNotify	Event Class crafttweaker.event.BlockNeighborNotifyEvent
ZenMethod onBlockPlace	Event Class crafttweaker.event.BlockPlaceEvent
ZenMethod onCheckSpawn	Event Class crafttweaker.event.EntityLivingExtendedSpawnEvent
ZenMethod onClientTick	Event Class crafttweaker.event.ClientTickEvent
ZenMethod onCommand	Event Class crafttweaker.event.CommandEvent
ZenMethod onCriticalHit	Event Class crafttweaker.event.CriticalHitEvent
ZenMethod onCropGrowPost	Event Class crafttweaker.event.CropGrowPostEvent
ZenMethod onCropGrowPre	Event Class crafttweaker.event.CropGrowPreEvent
ZenMethod onEnchantmentLevelSet	Event Class crafttweaker.event.EnchantmentLevelSetEvent
ZenMethod onEnderTeleport	Event Class crafttweaker.event.EnderTeleportEvent
ZenMethod onEntityJoinWorld	Event Class crafttweaker.event.EntityJoinWorldEvent
ZenMethod onEntityLivingAttacked	Event Class crafttweaker.event.EntityLivingAttackedEvent
ZenMethod onEntityLivingDamage	Event Class crafttweaker.event.EntityLivingDamageEvent
ZenMethod onEntityLivingDeath	Event Class crafttweaker.event.EntityLivingDeathEvent
ZenMethod onEntityLivingDeathDrops	Event Class crafttweaker.event.EntityLivingDeathDropsEvent
ZenMethod onEntityLivingEquipmentChange	Event Class crafttweaker.event.EntityLivingEquipmentChangeEvent
ZenMethod onEntityLivingFall	Event Class crafttweaker.event.EntityLivingFallEvent
ZenMethod onEntityLivingHeal	Event Class crafttweaker.event.EntityLivingHealEvent
ZenMethod onEntityLivingHurt	Event Class crafttweaker.event.EntityLivingHurtEvent
ZenMethod onEntityLivingJump	Event Class crafttweaker.event.EntityLivingJumpEvent
ZenMethod onEntityLivingUpdate	Event Class crafttweaker.event.EntityLivingUpdateEvent
ZenMethod onEntityLivingUseItem	Event Class crafttweaker.event.EntityLivingUseItemEvent.All
ZenMethod onEntityLivingUseItemFinish	Event Class crafttweaker.event.EntityLivingUseItemEvent.Finish
ZenMethod onEntityLivingUseItemStart	Event Class crafttweaker.event.EntityLivingUseItemEvent.Start
ZenMethod onEntityLivingUseItemStop	Event Class crafttweaker.event.EntityLivingUseItemEvent.Stop
ZenMethod onEntityLivingUseItemTick	Event Class crafttweaker.event.EntityLivingUseItemEvent.Tick
ZenMethod onEntityMount	Event Class crafttweaker.event.EntityMountEvent
ZenMethod onEntityStruckByLightning	Event Class crafttweaker.event.EntityStruckByLightningEvent
ZenMethod onEntityTravelToDimension	Event Class crafttweaker.event.EntityTravelToDimensionEvent
ZenMethod onExplosionDetonate	Event Class crafttweaker.event.ExplosionDetonateEvent
ZenMethod onExplosionStart	Event Class crafttweaker.event.ExplosionStartEvent
ZenMethod onFarmlandTrample	Event Class crafttweaker.event.FarmlandTrampleEvent
ZenMethod onItemExpire	Event Class crafttweaker.event.ItemExpireEvent
ZenMethod onItemFished	Event Class crafttweaker.event.ItemFishedEvent
ZenMethod onItemToss	Event Class crafttweaker.event.ItemTossEvent
ZenMethod onLivingDestroyBlock	Event Class crafttweaker.event.LivingDestroyBlockEvent
ZenMethod onLivingExperienceDrop	Event Class crafttweaker.event.LivingExperienceDropEvent
ZenMethod onLivingKnockBack	Event Class crafttweaker.event.LivingKnockBackEvent
ZenMethod onLootingLevel	Event Class crafttweaker.event.LootingLevelEvent
ZenMethod onMinecartCollision	Event Class crafttweaker.event.MinecartCollisionEvent
ZenMethod onMinecartInteract	Event Class crafttweaker.event.MinecartInteractEvent
ZenMethod onMobGriefing	Event Class crafttweaker.event.MobGriefingEvent
ZenMethod onPlayerAdvancement	Event Class crafttweaker.event.PlayerAdvancementEvent
ZenMethod onPlayerAnvilRepair	Event Class crafttweaker.event.PlayerAnvilRepairEvent
ZenMethod onPlayerAnvilUpdate	Event Class crafttweaker.event.PlayerAnvilUpdateEvent
ZenMethod onPlayerAttackEntity	Event Class crafttweaker.event.PlayerAttackEntityEvent
ZenMethod onPlayerBonemeal	Event Class crafttweaker.event.PlayerBonemealEvent
ZenMethod onPlayerBreakSpeed	Event Class crafttweaker.event.PlayerBreakSpeed
ZenMethod onPlayerBrewedPotion	Event Class crafttweaker.event.PlayerBrewedPotion
ZenMethod onPlayerChangedDimension	Event Class crafttweaker.event.PlayerChangedDimensionEvent
ZenMethod onPlayerClone	Event Class crafttweaker.event.PlayerCloneEvent
ZenMethod onPlayerCloseContainer	Event Class crafttweaker.event.PlayerCloseContainerEvent
ZenMethod onPlayerCrafted	Event Class crafttweaker.event.PlayerCraftedEvent
ZenMethod onPlayerDeathDrops	Event Class crafttweaker.event.PlayerDeathDropsEvent
ZenMethod onPlayerDestroyItem	Event Class crafttweaker.event.PlayerDestroyItem
ZenMethod onPlayerFillBucket	Event Class crafttweaker.event.PlayerFillBucketEvent
ZenMethod onPlayerInteract	Event Class crafttweaker.event.PlayerInteractEvent
ZenMethod onPlayerInteractBlock	Event Class crafttweaker.event.PlayerInteractBlockEvent
ZenMethod onPlayerInteractEntity	Event Class crafttweaker.event.PlayerInteractEntityEvent
ZenMethod onPlayerItemPickup	Event Class crafttweaker.event.PlayerItemPickupEvent
ZenMethod onPlayerLeftClickBlock	Event Class crafttweaker.event.PlayerLeftClickBlockEvent
ZenMethod onPlayerLoggedIn	Event Class crafttweaker.event.PlayerLoggedInEvent
ZenMethod onPlayerLoggedOut	Event Class crafttweaker.event.PlayerLoggedOutEvent
ZenMethod onPlayerOpenContainer	Event Class crafttweaker.event.PlayerOpenContainerEvent
ZenMethod onPlayerPickupItem	Event Class crafttweaker.event.PlayerPickupItemEvent
ZenMethod onPlayerPickupXp	Event Class crafttweaker.event.PlayerPickupXpEvent
ZenMethod onPlayerRespawn	Event Class crafttweaker.event.PlayerRespawnEvent
ZenMethod onPlayerRightClickItem	Event Class crafttweaker.event.PlayerRightClickItemEvent
ZenMethod onPlayerSetSpawn	Event Class crafttweaker.event.PlayerSetSpawn
ZenMethod onPlayerSleepInBed	Event Class crafttweaker.event.PlayerSleepInBedEvent
ZenMethod onPlayerSmelted	Event Class crafttweaker.event.PlayerSmeltedEvent
ZenMethod onPlayerTick	Event Class crafttweaker.event.PlayerTickEvent
ZenMethod onPlayerUseHoe	Event Class crafttweaker.event.PlayerUseHoeEvent
ZenMethod onPlayerVisibility	Event Class crafttweaker.event.PlayerVisibilityEvent
ZenMethod onPortalSpawn	Event Class crafttweaker.event.PortalSpawnEvent
ZenMethod onPotionBrewPost	Event Class crafttweaker.event.PotionBrewPostEvent
ZenMethod onPotionBrewPre	Event Class crafttweaker.event.PotionBrewPreEvent
ZenMethod onProjectileImpactArrow	Event Class crafttweaker.event.ProjectileImpactArrowEvent
ZenMethod onProjectileImpactFireball	Event Class crafttweaker.event.ProjectileImpactFireballEvent
ZenMethod onProjectileImpactThrowable	Event Class crafttweaker.event.ProjectileImpactThrowableEvent
ZenMethod onRenderTick	Event Class crafttweaker.event.RenderTickEvent
ZenMethod onServerTick	Event Class crafttweaker.event.ServerTickEvent
ZenMethod onSleepingLocationCheck	Event Class crafttweaker.event.SleepingLocationCheckEvent
ZenMethod onSleepingTimeCheck	Event Class crafttweaker.event.SleepingTimeCheckEvent
ZenMethod onSpecialSpawn	Event Class crafttweaker.event.EntityLivingExtendedSpawnEvent
ZenMethod onWorldTick	Event Class crafttweaker.event.WorldTickEvent

ZenScript
 Copy
events.clear();