With the clouds setting in it looks like we only have a day or so before the weather really changes and hopefully the snow starts to fall. So if you have a free afternoon or are off tomorrow maybe you will have time for a quick hike up to the Chapeau Chalet
From the top Lavancher it is only about an hours walk to the hut, mostly 4×4 to start with and then onto a bit of single track to finish. The view back down to Chamonix is amazing and if the sun is shining it is a real suntrap. I would also recommend walking a little bit past the hut to a viewing platform overlooking the Mer de Glace, from there you can also see all the way up to the Aiguille du Tacul.