Ventilation is your best friend before, during and after a session you’d prefer to keep as discrete as possible. If you make the mistake of hitting things hard in a sealed space, the smell is going to find its way into and onto everything in the vicinity. Fabric fresheners can help, but nothing gets the job done better than fresh air.
Keep as many windows and doors open as possible before and during the event. Afterwards, open even more doors and windows if possible, setting up a few oscillating fans to encourage good circulation in the space.
If growing cannabis indoors, the importance of good airflow and circulation cannot be overstated. If you don’t plan on setting up an advanced extraction system,at least treat your plants to a couple of basic desk fans and a consistent supply of fresh air from the outdoors.