Apple Announces April 8 iPhone OS Event

April is proving to be a big month for Apple. First the launch of the iPad and now, just two days later, the announcement of an invitation-only event to show off the next generation of the operating system that it will soon run, iPhone OS 4. The event is scheduled for April 8–three days from now–at Apple’s town hall.

Apple (AAPL) has been rumored to be adding some form of multitasking support for third-party apps in the next iteration of the OS. Perhaps we’ll hear something about it come Thursday.