Note: For this, I am using one of the deities in my homebrewn world. While some details are written here, this is where other information can be found on this deity:
Webyrd. This is her portfolio to give you an idea of what she is: Portfolio: Farming, Flowers/Plants, Rebirth/Renewal, Servitude, Spring.
Religion
While most would not expect this and, in fact, would scoff at the idea that the Goblins would worship such a deity considering what they perceive to be the vile nature of the Goblins versus the sweet, beautiful nature of Webyrd, the Goblins hold her in the highest regard. They actually believe themselves to be her representatives, made solely by her for her purposes. Considering that they are made of plants themselves and that when they die and a new Goblin is grown, their memories are essentially reincarnated within that new Goblin, those willing to ignore the prejudices of the Goblins may perhaps actually believe this themselves.
Webyrd is revered by all the Goblins with very few exceptions. While it might be thought that each caste may have their own deity or at the least that the Warrior Caste would worship the God of War, this is not the case. In fact, the Goblin Warriors are quite content to die in battle because they know that their memories will be reincarnated into another body and that their soul will go to Webyrd's pasture, the Vineyard.
Goblins believe that Webyrd watches over the Webyrd, treating as her own farmland to be cultivated. The Goblins, as her flock, are those chosen to be with her and with their help, they will show the other races in death what they cannot learn in life: life is fleeting, but death is glorious and reincarnation is the greatest honor, the will of Webyrd. No other race has such a swift growth and short lifespan; thus none can truly understand the feelings of Webyrd beyond their own kind.
Goblins do not have any holidays or celebrations of any sort. The reason is simple: most Goblins would not live to see a single holiday which came about once per year. The view life itself as a celebration, a sign that they worship Webyrd. In life they worship and no holiday could make them any more devout.