Virtual Reality (VR) is a promising immersive technology, which provides users with place and plausibility illusions in a virtual environment (VE). However, current immersive experiences are often limited to those users wearing a VR head-mounted display (HMD). In this paper we present VR Invite, a project-independent smartphone app, which allows multiple non-immersive bystanders to observe and interact with the VE and the HMD users. Our system renders multiple view ports of the scene on a host computer, and transmits the data via wireless local network to the mobile devices. Furthermore, the position and orientation of the smartphones is tracked to change the viewpoints accordingly.