The key to accommodate specific needs is to preparation. If you identify special needs in advance, you'll be able to find solutions adapted to these problems. You can use something as simple as an Excel sheet with names, needs and contact. You can also identify these needs by putting a button on the website page of your event, so that people with specific needs can declare them.

In terms of venue accessibility, I before ask the organizers how physically disabled people can access them. As for the Q&R, I always ask to write all the questions on interactive services (like Slido), to have all the questions visually written, for the hearing unpaired people. I also read them directly before asking to them, for the ones who have vision issues.

Make sure to make provisions for those with disabilities by asking them during the registration period.Provide braille and other visual aids to help the attendees who might need it.Consult or take guidance from experts on this domain to get valuable insights before the conference to make it successful.