The broadcaster is running the initiative to celebrate the fact that 5 million people have now registered with the viewer engagement strategy launched by chief executive David Abraham last year.
Marking the goal, Channel 4 intends to offer registered users the "unique opportunity" to take over 4seven, which launched on July 4 as Channel 4's first new network since More4 in 2005.
4seven offers viewers another chance to catch up on the Channel 4 programmes that have attracted the most online and social buzz over the past seven days.
People who registered with the broadcaster will be allocated a dedicated night on 4seven, in which they can pick their favourite Channel 4 programmes to be aired.
The idea behind Channel 4's viewer engagement strategy is that the more the broadcaster knows about its audience, the better placed it is to offer them what they want to watch.
The initiative also brings Channel 4 a wealth of valuable data on its viewers, which Abraham has previously described as the "new oil" of broadcasting.
