Singapore on Wednesday released more details on how it would curb the spread of the coronavirus at larger events as it continues to reopen its economy.An additional layer of contact tracing is to be introduced so that exhibitions and conferences of up to 250 participants can take place from October.At present, under a programme called SafeEntry, people must check-in online with their names and contact details before entering any building, such as offices, shops or restaurants.Lockdown life…