Of course they do - which is why disabled folk, more than most, will inform themselves, before they even commit to going to an event, that provisions such as parking will be available for them.
I was informed back in December 2015 that parking would not be an issue and on that basis I booked my ticket. At no point since has anybody contacted me to inform me otherwise. As they have both my e-mail and home address details, this would not have been a difficult or costly exercise once they became aware that it would potentially be an issue.