It seems to me that, in a sense, the Cross of Calvary was no anomaly, no betrayal of Christ unique to its place in time, or the people who actually took part in it. The Cross is always what happens to Jesus, to the Word Made Flesh, whenever He appears in this world we chose in place of the one He made; either in His full form in Jesus of Nazareth, the Second Person of the Trinity; or in His partial form, in His followers who, now and then, trust Him with their lives. Jesus could have dropped in anytime in human history and our charming species would have done Him in just the same.
More than that: if God's plan of salvation had been different, and Jesus had re-entered time every year somewhere on January 1, every generation would still have found a reason and a way to get Him to someplace like Calvary by 11:59PM on December 31. And probably much sooner: it was a quick five days from Palm Sunday to Good Friday, after all.