Grand Shaft April Open Day, Sunday 21 April, 10.30am - 4pm
https://www.whitecliffscountry.org.uk/whats-on/grand-shaft-april-open-day
Fit Dovorians should take it in their stride; unfit Dovorians should take breathing apparatus.
Remember, it is advisable to use this opportunity to climb these stairs now, as there may not be another opportunity before the Roman Painted House opens in July and, as every historian knows, you will get a nose bleed by travelling back too many centuries at once. For this reason, it'd be a good idea to use the Castle as a staging post sometime in May or June.