I am looking for the title of a book I read when I was a child, in about 1965 or so. It was about a girl who was at home, ill in bed, while her friends went to the 3-D movies. She couldn’t go due to her illness, but her friends brought her a pair of the 3-D glasses. When she put them on, she was transported to a magic world. It seems to me like there was lemonade rain but I’m not sure.
Does this ring a bell with you?
Try this: Joan Dell, The Missing Boy.
https://www.kirkusreviews.com/book-reviews/joan-dell/the-missing-boy/
Maybe either The Peculiar Miss Pickett by Nancy Julian or Mr. Pudgins by Ruth Carlsen.