sometimes it is straight up impossible accommodate some disabled people in a particular event. someone’s dietary needs are too restrictive for anything provided to be edible for them. sometimes your house or apartment has unavoidable stairs that your landlord refuses to have adjusted. sometimes a deadly allergen is going to have to exist in a workplace (for example a company that makes peanut butter is not going to be able to have a peanut free workplace).
the solution is not to deny this. the solution is to be upfront about it and let us make our own decisions and cost/benefit analysis about whether to attend.