Corrected Sentences:
- 1. On King's Day, children take part in lots of fun races.
- 2. They get into a sack and crawl.
- 3. There's also a dish and spoon race.
- 4. Another favourite is the four-legged race.
Explanation: The corrections involve changing 'King's Park Day' to 'King's Day' for a more common phrasing, adding 'a' before 'dish and spoon race' for grammatical correctness, and ensuring proper capitalization and articles.