I went to Bedok Stadium at about 6:45pm so that I can chat with people attending the rally. I was curious to know if most of the people attending came from the East Coast GRC or from other parts of Singapore. My small random sample of 6 people shows that roughly 50% came from the GRC and the rest came from other parts of Singapore . Of course using a sample of 6 is not rigorous but I observed that many came via MRT so it is likely that many people attending this rally came from other parts of Singapore rather than the GRC the rally was located in. This may explain why the turnouts at rallies often do not correlate with the election results.
I chatted with a stranger who was eager to point out all the PAP 'flaws' - greedy overpaid ministers who burden the people to fill up govt coffers. He went on and on to talk about problems caused by CPF, HDB, ERP and all the other PAP innovations. Needless to say he was wearing a light blue shirt with a hammer. He assumed that I was one of the "undecided" crowd who needed some enlightment. I suspect these rallies are "preaching to the converted". The enthusiastic crowd is not there to be lectured on the details of policy alternatives but they are there to be pumped up so that they go back and enlighten others. Many are probably already familiar with the issues- they are there not for information but for inspiration.
I got out of the stadium at about 9pm to go to the HDB block next to the stadium to take a few photos. I found crowds of people gathered outside to hear the speeches because they couldn't get in and there were even people listening to the speeches at the bus stop. The common corridor of the flats were lined with people at the higher floors.
The PAP has a propaganda machine which it uses to spread fear, threats, pork barrel incentives and advertise its past achievements to get less informed Singaporeans to vote for them. The opposition depends on their supporters to get their message to others and they use rallies to inspire and motivate with a powerful vision for a better future. Nobody attends PAP rallies because it is a waste of time - they serve almost no purpose when the PAP believes it can just scare, threaten and entice the people (with upgrading + grow & share $$) for their votes.