There is a mistake in each sentence below. Find the mistake and corect it

She asked him attend the school performance.
1. asked
2. attend
3. performance
Don't let her to go to the music festival!
1. let
2. to go
3. festival
Their parents will never agree buy that expensive piano.
1. agree
2. buy
3. expensive
To develop her musical talent, her father made her to sing at family gatherings.
1. To develop
2. made
3. to sing