Chá de bebêIt is a 'baby shower', a party for a women who is going to have a baby. Her friends take presents for the new baby. The plural is
chás-de-bebê.
Chá de panelaChá de panela ís party for a woman who will soon be getting married. Guests, usually only women, are expected to take presents for the kitchen or the home generally.
dar um chá de sumiçoThe expression means to disappear.
Chá de cadeiraThis phrase was originally used to refer to girls at a ball had to wait a long time to be invited to dance and had to patiently sit in the chair drinking tea. Nowadays, it is used for any long wait. The plural is chás-de-cadeira.