A few very important points in reference to 'הכנה משבת לחול' (doing an action on Shabbos for a weekday);
(Temporary Ohel) What are some of the conditions and guidelines to go along with temporary roofing, shelter, etc.
fixing a Hat, Dust on a Hat, a Dent in an Aluminum Foil Pan, Plastic Fruit Cup, and Shaking Down a Thermometer;