Bright Week, Pascha Week or Renewal Week (Greek: Διακαινήσιμος Ἑβδομάς) is the name used by the Eastern Orthodox and Byzantine Rite Catholic Churches for the period of seven days beginning on Pascha (Easter) and continuing up to (but not including) the following Sunday, which is known as Thomas Sunday. Latin Rite and other Christian groups such as Anglicans refer to this period as Easter Week, not to be confused with the Octave of Easter, which includes the following Sunday.
The entire week following Pascha is to be set aside by Orthodox Christians for the celebration of the Resurrection. According to the 66th canon of the Council in Trullo:
"from the holy day of the Resurrection of Christ our God until New Sunday (i.e. Thomas Sunday) for a whole week the faithful in the holy churches should continually be repeating psalms, hymns and spiritual songs, rejoicing and celebrating Christ, and attending to the reading of the Divine Scriptures and delighting in the Holy Mysteries. For in this way shall we be exalted with Christ; raised up together with Him. For this reason on the aforesaid days that by no means there be any horse races or any other public spectacle".
In Imperial Russia taverns were closed during Bright Week, and no alcoholic beverages were sold.
The entire week is considered to be one continuous day. The name of each day of the week is called "Bright" (e.g., "Bright Monday") and the week's services are unique, varying greatly from those during the remainder of the year. The services are entirely sung, and the Paschal hymns are included with the stichera taken from the Sunday Resurrection propers in the Octoechos, rotating through the various tones. Tone 1 is used Holy Saturday and at Paschal matins on Sunday, tone 2 Sunday night and Monday, etc., skipping the least festive heavy (or grave) tone and ending with the plagial 4th (aka, Tone 8) on Friday night and Saturday.