Q: Answer the question from the given passage. Your answer should be directly extracted from the passage, and it should be a single entity, name, or number, not a sentence.
Passage: The Grainger Market replaced an earlier market originally built in 1808 called the Butcher Market. The Grainger Market itself, was opened in 1835 and was Newcastle's first indoor market. At the time of its opening in 1835 it was said to be one of the largest and most beautiful markets in Europe. The opening was celebrated with a grand dinner attended by 2000 guests, and the Laing Art Gallery has a painting of this event. With the exception of the timber roof which was destroyed by a fire in 1901 and replaced by latticed-steel arches the Market is largely in its original condition. The Grainger Market architecture, like most in Grainger Town, which are either grade I or II listed, was listed grade I in 1954 by English Heritage. Question: How is the opening of the Grainger Market documented in the Laing Art Gallery?
A:
a painting