The Hock Lee Bus Strike led to rioting on 10 to 12 May 1955, in which 3 people were killed and 31 injured. During the strike, large numbers of dismissed bus workers locked themselves in the Hock Lee Garages in Alexandra Road and picketed at the gates. On, 30 April 1955, the eve of May Day, sympathy strikes spread to other unions affiliated to the Middle Road Group. Dock workers stopped the transportation of freight and passengers, threatening the economic life-line of Singapore. The island-wide industrial action grew increasingly violent with the support of students from the Chinese High schools.



At the inauguration of the Singapore Orthopaedic Association, the membership of the Association stood at less than ten. The first scientific meeting of the Association was a combined meeting of the Singapore Orthopaedic Association and Singapore Surgical Society and was held on 30 April 1968.



On the 30 April 1979, at a meeting called by Mrs S.C. Tang, Executive Director of the Singapore Council of Social Service, the floor nominated a pro tem committee, comprising Mrs Julie Tan (Chairperson) Mrs Caroline Lam (Chairperson), Mrs. Anamah Tan, Mrs Seow Peck Leng, Mrs Maureen Tan, Mrs Mary Ho and Mrs Tan Bee Choo's Representative. The Constitution was drawn up by the committee which was then sent to twenty four women's organisations and the Registrar of Societies in October 1979. The name that was finally approved by the Registrar was "Singapore Council of Women's Organisations".



Business at Change Alley, which sat on prime land, saw a dwindling number of customers in the 1980s. This was attributed to a number of reasons such as the decline in sea travel, competition with modern air-conditioned shopping centres, and the withdrawal of foreign troops from Singapore. On 30 April 1989, the shops in Change Alley opened for the last time after a period of bargain sales to clear stocks. Affected stallholders were offered the option of renting sundry and cooked-food stalls at markets and food centres.




The design by Singapore firm ARC Studio Architecture + Urbanism was selected as the winner on 30 April 2002 from more than 200 entries. The design of The Pinnacle@Duxton (picture modern building) won over the local and international panel of judges with its optimal use of the 2.5-hectare (25,000 sq m) location.



The general election of 2006 has been considered by analysts to be a landmark election in the history of Singapore, because of the heavy use of the internet and blogging that covered the election, which escaped government regulation. Just before the election, on 1 May 2006, the government issued a cash bonus, called the "progress package" to all adult citizens, worth SGD $2.6 billion. The PAP returned to power in the election winning 82 out of 84 seats, and 66% of the votes. During the election campaign period, there were large turnouts at many opposition rallies, with Malaysian newspaper The Star estimating that over ten thousand people attended one rally held on 30 April 2006.