I have noticed that there is still some suffering amongst those who camp outside during protests, mostly due to cold but sometimes due to rain.

There is one material that will maintain both warmth and dryness in case of rain- plastic.

Perhaps plastic bags could be collected to create a canvas under which bags can be stored, sleeping can take place and people can shelter. Simply cut open the plastic bags so that they spread out across their maximum surface area, then super glue them together (avoid holes between bags) and finish off by binding them with ducktape. You could also spray this with paint on one side to further strengthen the durability of it. With some rope this could be used as a tent, and with a bike it can be used to store your bags and ensure they are kept dry all night. It can be folded up and placed in a bag using very little space provided it is not too large.

Inside your backpack there should also be a bin liner inside of which you have packed your extra clothes, most importantly dry shirts and socks, but also an extra pair of tracksuit bottoms. Wet clothes can be hung up on rope when the sun is out.

Make sure that you are carrying an item of clothing that insulates properly, to be taken off during the day and placed on at night.
If you are sleeping in the wild make sure that your sleeping bag will keep you warm all night, but try not to sweat too much at this point as the wetness will affect you negatively later. Using a scarf wrapped around your head your chin will not freeze. Tighten the bag so only your nose and mouth is outside. Remember that the condensation from breathing will eventually also impact negatively on you if it is trapped behind fibre.

Stay dry, stay warm, stay happy.