The church as a whole does not, I'm convinced, actively ignore the crucifixion and resurrection of our Lord. However, for much of the year these wonderful truths are not the church's focus. Simply put - they should ALWAYS be the church's focus. These two events stand at the epicenter of our faith and salvation. They are of core importance.
Paul reminds us of this in I Corinthians 15:3-8 (ESV).
3 For I delivered to you as of first importance what I also received: that Christ died for our sins in accordance with the Scriptures, 4 that he was buried, that he was raised on the third day in accordance with the Scriptures, 5 and that he appeared to Cephas, then to the twelve. 6 Then he appeared to more than five hundred brothers at one time, most of whom are still alive, though some have fallen asleep. 7 Then he appeared to James, then to all the apostles. 8 Last of all, as to one untimely born, he appeared also to me.
The apostle refers to Christ's crucifixion and resurrection as "of first importance."
We live in a culture that is extremely busy, if not very efficient. As often happens, the church emulates the culture. Most churches have all sorts of activities. Larger churches, especially mega-churches, have stuff going on all the time. My belief is that all this busyness is the primary cause of the lack of focus on the death and resurrection of Christ.
Let's be less busy. Let's also be like Paul and remember what is of first importance.