The whole world celebrates holidays surrounding the incarnation (Christmas), death (Good Friday), and resurrection (Easter) of Jesus Christ, but very little attention is given to Jesus’ ascension, even in the Church. But the ascension is kind of a big deal.
Hebrew Scripture prophecies it. The New Testament’s most quoted Old Testament verse is about Jesus’ ascension. Peter’s Pentecost sermon cites the ascension as proof of Jesus as Israel’s exalted messianic king. When we say “Jesus is Lord”, or “Jesus is King” we mean, Jesus has ascended!