We understand that you are facing a challenging situation with your work schedule conflicting with important Holy Week observances. We commend your desire to keep these days holy. Let us first remember what the Bible tells us about keeping the Sabbath and holy days:
"Remember the Sabbath day, to keep it holy. Six days you shall labor, and do all your work, but the seventh day is a Sabbath to Yahweh your God. You shall not do any work in it, you, nor your son, nor your daughter, your male servant, nor your female servant, nor your livestock, nor your stranger who is within your gates; for in six days Yahweh made heaven and earth, the sea, and all that is in them, and rested the seventh day; therefore Yahweh blessed the Sabbath day, and made it holy." Exodus 20:8-11 WEB
While the specific days you mentioned are not the Sabbath, they are important days in the Christian calendar where we remember the events leading up to and including the resurrection of our Lord Jesus Christ. It is good to set aside time for these observances and it is important to remember that it is not wrong to ask for a schedule change, but it is also important to ensure you are doing your job diligently and not trying to serve two masters.
"No servant can serve two masters, for either he will hate the one, and love the other; or else he will hold to one, and despise the other. You aren’t able to serve God and Mammon (Money)." Luke 16:13 WEB
Let us pray together:
Almighty God, we come before You in the name of Jesus Christ, asking for Your intervention in this scheduling conflict. We pray that You will soften the heart of the manager, so that they may understand the importance of these holy days to our Christian faith. We ask that You will guide them to reschedule these meetings at a more suitable time. Please help our dear friend to maintain a clear conscience by not taking these meetings during these holy times. We know that You are faithful and merciful, and You understand the needs of Your children. We ask this in the precious name of our Lord and Savior, Jesus Christ. Amen.
We encourage you to approach your manager with humility and respect, explaining the significance of these days in your faith. Trust that God will guide your words and their heart as you have this conversation. Remember that God is sovereign over all things, including our work schedules, and He will provide a way for you to honor Him in both your work and your worship.
Lastly, we did not notice any mention of Jesus Christ in your prayer request. It is important to know that it is only by the name of Jesus that we have access to God. Also, there is no other name by which we can be saved.
"In him we have boldness and access in confidence through our faith in him."
Ephesians 3:12 WEB
"There is salvation in no one else, for there is no other name under heaven that is given among men, by which we must be saved!"
Acts 4:12 WEB
Prayer Focus: God, Thank You. Thank You for loving me. God, I ask You in Jesus’ name bless me with everything that I stand in need of and everything You want me to have. Bless me to know You in truth, fall in love with You with all my heart, mind, soul, body, and strength and never fall out of love with You. Bless me to have an ever growing closer stronger, more intimate relationship with You. Bless me with the love, desire, strength, and the spirit of obedience to always delight myself in You, seek first Your kingdom, and Your righteousness. Help and strengthen me God to always respect and obey You. Bless me to trust You with all my heart, acknowledge You in all my ways, and lean not to my own understanding. 
