If you place four discos together, a mirror ball will appear on the ceiling and a DJ sound system will appear with an android operating it. This will fill the fun bar on a colonist quicker.
Get the two colonists that you want and build up their friend relationship. When you click on the heart, if the "Will you be mine" part is 49% or higher, tell them to do that.
Get someone to use a Silicon Collector. When all the silicon is coming through, tell them to do something else. The sparks should stop.