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"'They do say,' Mr. Adams said to Old Man Warner, who stood next to him, 'that over in the north village they’re talking of giving up the lottery. '

Old Man Warner snorted. 'Pack of crazy fools,” he said. “Listening to the young folks, nothing’s good enough for them...'"
Old Man Warner is against the idea of giving up the Lottery because he's been around for the whole thing. He still believes without the sacrifice, there will be no corn.

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The Capitol keeps up with this tradition every year because that is how their society works. They do it for their own entertainment and fun, while the districts aren't familiar with the other ways of life so they're used to it.  Nobody is the type to rebel or think of stopping the tradition, so it continues to be one.

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The ritual in "The Hunger Games" is for the Capitol's entertainment, and also to remind the districts that the Capitol has more power over them.

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The meaning of ritual in "The Lottery" is a sacrificial ritual in the hopes of good crops in the upcoming harvest. The townspeople believe it because their oldest citizen, Old Man Warner says, "'Used to be a saying about Lottery in June, corn be heavy soon.'"
So, they sacrifice a human in return for good crops.

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To keep the stranglehold over the districts, the Capitol does a life-or-death competition. It keeps the districts in their place so the Capitol still shows they have power over them.

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Meanwhile, the lottery happens every year not for fun unlike "The Hunger Games"
It happens because the villagers believe it's a good sacrifice to help benefit the village.