There's
twinkle twinkle little star themed playdough? you'd need yellow or white dough, star shaped cutters, glitter,
glow in the dark stars and bright
torches to charge them (they won't be that visible in the daylight but should brighten enough for the children to notice a change).
Star shape activity mat - outline star tracing mat
This activity would enable you to talk about night time and the stars in the sky. You could share observations about colour, shape, size, quantity, stack stars into towers, spread them out, cut them up and decorate the surface of the playdough which supports children's creative expression.
You could also have a storybook at the ready, to read during the activity?
Night Monkey Day monkey is a nice read. You could talk about how light from the sun stops us seeing the stars during the day and when the sun goes down the stars in space shine.
Space themed story books
Hope this helps xx