Tara Whelan, 18 was last seen in Halifax Town Centre on Market Street on the morning of Tuesday 15 December.
Sir Quentin Blake KBE, best known for his distinctive illustrations in the books by Roald Dahl, has donated a one-of-a-kind drawing to help raise funding.
Bar Rouge in the Halifax town centre had to close after persistently breaking rules to protect staff and customers from the risk of COVID-19.