Riddonkulous

My first three are the same as the first three the guy who made discoveries using dogs and bells. Or a sweet dessert named after a Russian ballerina. My last four are what Snoop changed Dogg to for a brief period. There are a few letters in between, that sound like another word for sick. Overall, I’m a larger structure found in many different settings, including parks, gardens, fairs, and trade shows. I’m also an area at some sports complexes.