Clouds on stage: Seeking advice from techs

I can't remember what Parachute Silk is worth as it not really silk & a man made fibre, it can't be that costly to cover a stage like the Old Mill.

The hazer or fogger would be a good addition to compliment the mise en scene. As I have not been cloud walking lately. Movement thru the clouds would be similar to that simulated by the hazer, as Don & Na suggested.

Besides just anchoring at the corners, the luvvies on the boards would lend to the billowing effect & holding the fabric  in lumps & bumps. You may need something like 4 or more turbo & even other type fans to capture enough air to give the cloud effect.

The warm props could wear white Jiffy's on their feet & this will save from slipping or sliding & probably a wee bit healthier, with the transmission of any foot problems, between each other.

Also I would ensure that there is a carpet runner on each side in the wings, to reduce any dust or dirt on the soles of the jiffy's. Which would show up on the white material. As David posted you can get some really good lighting effects from the general wash & also  on the silk from the lighting from the floor ['X' ] position.

Further the silk can be a reusable resource for other productions.

If you go with the stage cloth idea, you will need to apply Fire Retardant, but you find you can purchase it already treated. Also you will need to 'Idiot Proof' the Parachute silk, during the production. By striking the cloth immediately after the performance. So no yoyo walks across it in street shoes or high heals, treat it much the same as a Tarquette or Marley Dance mat.

If the venue has raked seating, you use a set of Footlights [Floats] along with a ground row flat to mask them. All you need is a 1' wide [Jogger] flat, on it's side, with clouds profiled along the joggers stile edge.