Today is the 60th annual National Day of Prayer, traditionally held on the first Thursday in May.
It almost didn't happen this year. An eleventh-hour ruling by the Seventh Circuit Court of Appeals found only last month that this observance is indeed constitutional, allowing President Barack Obama, whose administration defended the day in court, to issue the traditional annual proclamation calling for a national day of prayer.
Recently reading the McCullough bio John Adams, I read where Jefferson protested a national fast day proposed by John Adams back when they were drafting the Declaration.