Which word means to honor the memory of something with an observance or ceremony?

In 1084, forces led by Robert Guiscard sacked Rome; they belonged to which people, who had conquered England 18 years e… Which state's record high, 109°F, was set on July 10, 1936, in Cumberland and Frederick? Which action figure stood 11 1/2 inches tall when he debuted in 1964 but shrank to 3 3/4 inches by 1982? About $11 billion in alleged accounting fraud played a part in which long-distance company's July 2002 bankruptcy? Which 11-letter word names the sac that contains the heart? Which 11-letter term means without a beard or mustache? "Twelve little girls in two straight lines" live with which heroine, whose rescue story won the 1954 Caldecott Medal? Which city, capital of Lombardy, is the largest in Italy's Po Valley?