Say that someone is hosting a parents meeting (PTA, or that kind of thing) at their home. One of the potential invitees has a life threatening allergy to a certain substance, if it's in the AIR, she will have a reaction.
Is it reasonable for her to write to the host asking that they not use any air fresheners in case they contain her allergen? Or to just leave if she starts to have a reaction (Keep in mind she might not be able to vocalize if the reaction affects breathing; and might need an ambulance if it's bad enough)? Or is it better to just avoid all parent meetings if she can't control the setting completely, just in case she has a bad reaction?
What would you think if a parent wrote to you asking that you avoid certain common substances during and just before a meeting you offered to host? (For their sake, not their children's allergy)