I would use the ESERO What can you see? Looking at constellations resource https://esero.ie/wp-content/uploads/2015/01/34_What-can-you-see.pdf to introduce the children to the concept of constellations. Then I would model how to use Stellarium https://stellarium.org/ posting details on the home-school communication App so parents can also see how to use it. In small groups the children would be given a constellation to research and create a star lantern https://www.spaceweek.ie/wp-content/uploads/2020/04/Make-a-Star-Lantern.pdf
As an extension activity I would challenge the children to find their constellation at night as part of their homework and invite them to take a photo to share with the class. A guide on what constellations are visible at different times of the year can be seen at https://www.skyatnightmagazine.com/advice/constellations The children would be able to present their projects to the whole-class and engage in a Q&A.