Both Christmas Day and 26 December (Boxing Day) are public holidays throughout Australia. Although Christmas in Australia is celebrated during the Southern Hemisphere summer, many Northern Hemisphere traditions are observed in Australia – families and friends exchange Christmas cards and gifts and gather for Christmas dinners; sing songs about snow and sleighbells; decorate Christmas trees; and tell stories of Santa Claus. Nevertheless, local adaptations have arisen – large open-air carol concerts are conducted on summer evenings before Christmas – such as the Carols by Candlelight in Melbourne and Sydney's Carols in the Domain. The Christmas song "Six White Boomers", by Rolf Harris, tells of Santa undertaking his flight around Australia hauled by six white-boomer kangaroos in place of reindeer. Christian carols such as "Three Drovers" or "Christmas Day" by John Wheeler and William G. James place the hymns of praise firmly in an Australian context of warm, dry Christmas winds and red dust. Although a hot roast dinner remains a favourite Christmas meal, the summer temperatures can tempt some Australians toward the nearest watercourses to cool down between feasts. It is a tradition for international visitors to gather "en masse" at Sydney's Bondi Beach on Christmas Day. The Assyrian Church of the East is also known to be a crowd drawer for the special Christmas Eve midnight mass. More than 15,000 faithful gather at churches in Sydney, notably the St Hurmizd Cathedral in Sydney's west. The Christian festival of Easter commemorates the Bible's account of the Crucification and Resurrection of Jesus Christ. In Australia, in addition to the religious significance of Easter for Christians, the festival is marked by a four-day holiday weekend starting on Good Friday and ending on Easter Monday – which generally coincides with school holidays and is an opportunity for family and friends to travel and reunite. Across Australia, church services are well attended, as are secular music festivals, fairs and sporting events. One such Easter event is Easterfest an annual Christian Music Festival in Queen's Park Toowoomba and known as the largest drug and alcohol free festival in Australia. Traditional Easter foods commonly consumed in Australia include Hot Cross Buns, recalling the cross of the Crucifixion, and chocolate Easter Eggs – symbolic of the promise of "New Life" offered by the Resurrection. Although chocolate eggs are now eaten throughout the period, eggs were traditionally exchanged on Easter Sunday and, as in other nations, young children believe their eggs to be delivered by the Easter Bunny.