On wedding invitations, etiquette authorities agree, the year is traditionally written as text. It is for this reason, I suppose, that some authorities think to address capitalization of the year. However, there is no consensus. It is more common to see the advice to capitalize the first word of the year (only). Most Google search results for [ capitalize year wedding etiquette ] give this advice.
Mesa County, Colorado (CO) County population in 2014: 148,255 (87% urban, 13% rural); it was 116,255 in 2000. County owner-occupied with a mortgage or a loan houses and condos in 2010: 29,788. County owner-occupied free and clear houses and condos in 2010: 11,718. County owner-occupied houses and condos in 2000: 33,306.
Vail, Colorado. The Town of Vail is a Home Rule Municipality in Eagle County, Colorado, United States. The population of the town was 5,305 in 2010. The town was established and built as the base village to Vail Ski Resort, with which it was originally conceived. Vail Ski Resort's first season was in December 1962; it is the largest ski mountain in Colorado.