Hi shuling, you can ROM on sat, sunday and PH too.. Their website mentions:
How can I get married on a Sunday or Public Holiday?
You may get married on a Saturday, Sunday or Public Holiday by choosing any venue outside the ROM.
Source:
http://app.customerfeedback.mcys.go...e=2004121394837&m_strTopicSysID=2004121394951
The outside venues that they mentioned are:
* Community Club
* Private Club
* Church/Temple (Buddhist, Sikh, Hindu - please enquire from the respective church/temple)
* Hotel or Restaurant
* At Home, void deck or condominium poolside
* Tourist Attraction eg. Sentosa, Botanic Gardens Mount Faber
* The place where both of you first met
* Others
The FAQ on this page is v useful:
http://app.rom.gov.sg/internet/reg_info/rom_married_outside.asp
Hope this helps, congrats!!