Red vestments are typically worn in church during the following occasions:
* Pentecost: To symbolize the Holy Spirit's descent in tongues of fire.
* Feasts of the Passion of Christ: Such as Good Friday and the Feast of the Holy Cross, to commemorate Christ's suffering and sacrifice.
* Feasts of Martyrs: To represent the blood shed by Christian martyrs for their faith.
* Confirmation: In some traditions, red may be worn to represent the fire of the Holy Spirit received in the sacrament.
It's worth noting that liturgical practices can vary somewhat between different denominations and even within different parishes of the same denomination, so it's always best to check with the specific church or tradition for the most accurate information.