Russian site “Hi-Tech.Mail.Ru” has received an invitation for a Nokia event which will be held on 28th Aug in Moscow, Russia. Interestingly, the event is titled as “World premiere” and there is a piano in background. It is very hard to guess as the Nokia Tablet is now tipped as scheduled in September and Phablet may come in November. So is Nokia going to announce dual-sim Lumias? Though, according to a tip received by us, dual-sim Lumias were supposed to come in October, but you never know.