Student or Learner
Celebrating St George and the Bard | NewsLondon celebrates St George's Day and Shakespeare's 444th birthday today.
This report was published three days before Shakespeare's actual birth date. The auther used the simple present tense here because the celebration was not taking place on very day and was thus an ongoing matter then. Had the same setence been written and published on April 27th, the writher would have used iscelebrating over celebrates.
Am I right to think so?
In regular conversation, we would expect to hear "is celebrating", which is the present progressive, of course.