We have the Spirit of God so that we might be empowered, just as Jesus was. We are His missionaries, filled and anointed by His Spirit. If you have the Spirit of God, you are a missionary sent by Jesus to tell the world who He is and what He does.
Charles Spurgeon said, "Every Christian is either a missionary or an imposter". Everywhere you go, whatever you do, you are a missionary sent by Jesus to love like Jesus, overcome sin like Jesus, proclaim the gospel like Jesus, and see people's lives changed by the power of the Spirit that raised Jesus from the dead.
You are always on mission. Every part of your life, every activity and event, is a part of Jesus's mission to make disciples.
Jeff Vanderstelt, Saturate: Being Disciples of Jesus in the Everyday Stuff of Life