(written by Fionn, 1-Feb-16 / updated to Asana)

• Teacher informs Director of Studies that he/she needs cover.
• Director of Studies finds a replacement teacher, and sends a note on Slack with a variation of the following message:
  “Cover class: << regular teacher name>>’s <<class name>> class will be taught by <<cover teacher name>> on <<date>>.”
• Director of Studies updates “Cover Classes” Google spreadsheet.
• DoS sents both the regular teacher and the cover teacher message on LangLion, with a variation of the following message:
  “Cover class: Hi <<regular teacher name>> and <<cover teacher name>>. This is confirm that <<regular teacher name>>’s <<class name>> class will be taught by <<cover teacher name>> on <<date>>.”