An important tradition to expose our students to tomorrow. If you can't get a priest or deacon, anyone can perform the blessing of throats, even the students themselves (though I would exercise great caution in that case to avoid it becoming a big joke).
The prayer, said while holding blessed candles at the throat: Through the intercession of Saint Blase, bishop and martyr, may God deliver you from every disease of the throat and from every other illness in the name of the Father and of the Son and of the Holy Spirit. Amen.
The order of blessing can be found at Catholic Culture. You might consider have a service of the Word in your classes. What a wonderful lesson!
This video may also be helpful:
