hi
i don �t know if my suggestion would be helpful but here is a list of grammar points and suggested ideas to link with:
*present simple - changing habits / statics about certain subject like smoking, cell phones, etc.. book / movie review.. festivals around the world!!
*present perfect - inventions and how they affected ourlives...
*passive - robbery or any accident repoted in a newspaper or news, you also could ask your students to record news, type them and underline passive voice sentences..
*first conditional - weather and plans for the weekend (if it �s hot on weekend, we �ll go for a picnic... etc)
*present progressive: a live report from football staduim..
* future: fortune coockies or the future teller!!! it would be a nice idea if students bring a crytal ball and pretend to tell the future of each other... or prepare coockies with paper notes about the future inside!!!
* used to: time capsule... or conversation among friends about t.v programs they used to watch..
* past simple: a historical report of your country..