As you may know, there really is no "Christian Calendar" that is apart from the Lord's Calendar, which some falsely identify as the Jewish Calendar. The calendar does matter. For members of the Body of Christ or followers of "that way," as it was known in the earliest times, we are not compelled to observe the holy days as those who profess to follow the law of Moses. Yet, we are to watch, according to the Lord's commands to watch, and this requires giving attention to the holy days and what the biblical text and the holy spirit reveal about them.
If you choose to celebrate with others in the traditions of assembling together, we pray that you are mindful about why you are participating. If you are led by the Lord to honor Him in the assembly, do so with joy in your hearts and give Him praise and glory. But, here's a warning, a word to the wise. Be cautious not to offend The One you intend to honor, like the vast majority will surely be doing. If you are not confident where the limits are in your participation in the religious traditions, it is better to be separate yourself than to join in the practice of idolatry.
4 I heard another voice from heaven, saying, “Come out of her, my people, so that you will not participate in her sins and receive of her plagues; 5 for her sins have piled up as high as heaven, and God has remembered her iniquities. ~ Revelation 18:4-5
Consider what continues to be done in the "high places" that idolaters have continually been drawn to for worship.
If you are compelled to join the local assembly we encourage you to pray while there, for the Lord to bless those who have genuinely come to find the Lord and His help. Pray for those who are openly sinning, if that is His leading, or not, as the case may be. He knows what He wants. If you are there at His leading, you may find that you're actually there for conviction and discipline, and humbling, or in contrast for a season of being touched with the Lord's love, with expressions of His heart and mind toward His people that love Him, who are truly small in number. You may be attending as an observer, or the Lord may even turn you away. He watches over the purity of His Beloved. Sometimes we may be shielded and at other times we may be raw and exposed to what must be witnessed, or we may be wielding the sword, in the language of the spiritual warfare in which we are intensely engaged.
We have been led to write on the subject of the Christian Calendar occasionally, and you may find these studies helpful.
Search The Open Scroll Blog for Palm Sunday
Search The Open Scroll Blog for Easter
The Dark Secret of the Eucharist and the Rite of Communion
Ash Wednesday - A "Fourth Day" Ritual Prefiguring the Mark of the Beast
The Sign of the Queen of Heaven