(Temporary Ohel) Very important pointers in reference to temporary walls;
"צביעה באוכלים" (coloring in foods) - the stringent view of some poskim
Understanding the Difference Between טירחא יתירה (Tircha Yeseira, Major Exertion) and טירחא סתם (Tircha Stam, Minor Exertion) on Shabbos;