Sentence:  Centering around this historic old structure , a group of public-spirited Barbour County citizens have organized and planned a week-long series of events , beginning on May 28 th and continuing through June 3 rd , to <WSD>observe</WSD> most appropriately the centennial of the first land engagement of the Civil War at Philippi . 
Meaning of the word marked with <WSD> tags:  behave as expected during of holidays or rites