Ash Wednesday.

Remember, O man, that you are dust, and unto dust you shall return.
{Genesis 3:19}

Ash Wednesday is the first day of the penitential season of Lent, in which ashes are placed on the head or forehead of the faithful. It is a fast day and usually falls in February. In 2010, Ash Wednesday falls on February 17 churchyear.net.
Ash Wednesday derives its name from the practice of placing ashes on the foreheads of adherents as a sign of repentance. The ashes used are typically gathered after the Palm Crosses from the previous year's Palm Sunday are burned. In the liturgical practice of some churches, the ashes are mixed with the Oil of the Catechumens (one of the sacred oils used to anoint those about to be baptized), though some churches use ordinary oil. This paste is used by the minister who presides at the service to make the sign of the cross, first upon his or her own forehead and then on those of congregants. The minister administering ashes recites the words: "Remember (O man) that you are dust, and to dust you shall return", or "Repent, and believe the Gospel."

Have a blessed Wednesday to all =)