Sentence:  United Nations Day is the birthday of the United Nations , mankind 's noblest attempt to establish lasting peace with justice ; And now , therefore , do I , John A. Notte , Jr. , Governor of the State of Rhode Island and Providence Plantations , proclaim Tuesday , October 24 th , 1961 , as United Nations Day , calling upon all our citizens to <WSD>engage</WSD> in appropriate observances , demonstrating faith in the United Nations and thereby contributing to a better understanding of the aims of the United Nations throughout the land . 
Meaning of the word marked with <WSD> tags:  carry out or participate in an activity; be involved in