Sentence:  <WSD>Centering</WSD> 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 observe most appropriately the centennial of the first land engagement of the Civil War at Philippi . 
Meaning of the word marked with <WSD> tags:  center upon