September 14 is designated as Holy Cross. The lectionary readings are Numbers 21:4-9; Psalm 98:1-5; 1 Corinthians 1:18-24; and John 3:13-17.
Methodists generally do not recognize this day. Scrolling through the web I find that Catholics, Anglicans, and Lutherans do. Here's an article by John Pridmore in Church Times that I found helpful in thinking about this occasion:
Holy Cross Day.