Predicting religious holidays

Ever wondered why it's so difficult to portend when Hari Raya Puasa/Haji, Deepavali, Vesak Day, Chinese New Year comes every year? Fret no more, as an NUS Maths professor explains how the different calendars (lunar, solar, Gregorian, lunisolar etc.) come together to make planning leave so chaotic.

Source: http://www.math.nus.edu.sg/aslaksen/calendar/public-talk.pdf

Vesak Day

Vesak Day is just a fortnight away and I hear of exciting plans for the evening before and the day itself. Pasir Ris Park's Fisherman's Village, cycling at Pulau Ubin and a movie marathon have all been touted as viable options. Can't wait.
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Our intrepid recce team has just completed their recce of Ubin. Looks good and they really did a good job. Can't wait.