Tree can be used for Refuge. you are likely to find Ground in/at/on Tree. Ground is related to Sky. Sky is related to Day. 
one thing you do when you Help is Thank. Thank is related to Please. 
Refuge <--UsedFor-- Tree <--AtLocation-- Ground <--RelatedTo--> Sky <--RelatedTo--> Day 
Help --HasSubevent--> Thank <--RelatedTo--> Please 