It looks like you've repeated a few phrases. Here’s a review of them:
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"You’re car is parked in the wrong spot."
- Correction: "Your car is parked in the wrong spot." (Use "your" for possession.)
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"They’re not be attending the meeting today."
- Correction: "They’re not going to be attending the meeting today." (The phrase needs the word "going" for it to make sense.)
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"It’s going to be a great day for a picnic."
- This sentence is correct! (It uses "it’s" correctly to mean "it is.")
If you need further assistance or more examples, feel free to ask!