system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: There are never more than 4 World Cup games on a day. Why do they need 12 venues?
gpt
I think the healthiness of the grass is one of the major factors. If a pitch is played on constantly the grass would be destroyed. They probably wait a few days to get some good watering and a cut to get it back up to scratch.