Plans that fit your needs
Ask a venue about the access details you need
Venue websites often say "accessible" without describing the actual route. A specific list of questions sent by email or message gives staff something concrete to answer and leaves you a written record.
Reviewing your venue access questions
Check that each question asks for one clear detail. "Is the venue accessible?" invites a vague yes. Ask about the lift's current status as well as its existence, since a lift that exists may still be out of service. Make sure the draft doesn't assume staff are on site at all hours. A venue's confirmation is useful context, but it doesn't guarantee what you'll find on arrival.
What to do with the answers
Keep the replies with your travel plans. If an answer is vague or points to a document, ask again for the exact detail you still need. For a large or complicated venue, call as well as write, and note down what you were told and who said it.