Christadelphians traditionally do not celebrate Christmas or Easter, viewing these holidays as having pagan origins that were incorporated into Christianity after the New Testament era. Neither the birth of Jesus in December nor the celebration of the resurrection on a specific annual festival day has warrant in the New Testament, in Christadelphian reading. The weekly breaking of bread on Sunday — commemorating Christ's death and resurrection every week — is the appropriate New Testament observance, not annual holiday celebrations.

This avoidance of Christmas and Easter is not universally strict across Christadelphianism, and practices vary among individual families and ecclesias. Some Christadelphians participate in cultural aspects of these holidays with their families while not treating them as religious observances. Others avoid them more strictly. There is no single authoritative ruling on this question, and individual communities handle it according to their own judgment.

Christadelphians do not observe the Jewish festival calendar (Passover, Tabernacles, etc.) as binding on Christians, though they regard these as typologically significant — pointing forward to the realities fulfilled in Christ and the coming kingdom. Their spiritual calendar is organized around the weekly breaking of bread and the regular reading and study of Scripture rather than annual festivals.