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Welcome to Mysidia Adoptables. I'd say you probably have to find a way to build events yourself since it's hard to code a flexible event system in the game using raw php. Adoptables do not get sick, but with some modifications its possible to achieve that. I do not recommend making your site that much like dragcave, in my mind every site should be unique in order to get popular. If people see your site as a clone of dragcave, it will be difficult for you to compete in the market.