it is more organisational structure that I am lack rituals and holidays are easy to knit from whole cloth.Since you are looking for possible models on a polytheistic temple these are real world ones that a bunch is known about.
Hinduism is a diverse living polytheistic faith with over a billion followers so it is a possible model (and from the diversity, multiple possible models) to gain an insight on how to do a polytheistic faith in a game. Wikipedia articles, children's books about Hinduism for Hindus, The Idiot's Guide to Hinduism, fairly concise online articles, library copies of the Teaching Company's college classes on introduction to Hinduism (audio CDs or DVDs) are all possible pathways to getting an insight.
Different strains of Buddhism and Taoism include polytheistic faiths as well and could be similarly used as different models.
Ancient classical and to a lesser extent Egyptian polytheism has a lot of research and knowledge about them as well and similar researches could be done. For western fantasy audiences this is typically the mythology base that comes to mind first and is most familiar, even if the actual religious and temple and worship aspects are not familiar to most modern Western audiences.
These are if you want a realistic model for your game's polytheism.
This is for a game so other priorities are reasonable too.
Other models could be media genre ones, if you like pulp fantasy genre stuff then reading R.E. Howard's Conan stories for how various religions and religious practices are portrayed in different stories would be a great basis, keeping in mind cultural sensitivity issues as you read 30's pulp fantasy. He is a great writer and different religions and religious practices come up in stories involving Stygian Set worship, Pictish religious practices, Mithraism, and Conan's relationship with Crom and Bel and such.