Children can share in the celebrations at Crowland library as it celebrates 40 years in its current purpose-built premises.
The actual anniversary is Saturday, but the library has been holding events all week, including family history sessions.
But today is the turn of Bookstart Bear, who is inviting pre-school children to join him between 2.15pm and 2.45pm.
The library has also been running a photographic display portraying its history.
Coun Nick Worth, Lincolnshire County Council executive member for libraries, said: “Congratulations to Crowland library as they celebrate four decades, especially poignant with the site being one of the first library partnerships in the county as the library has always been proactive on the volunteer front.
“It’s also a double celebration as it’s the seventh anniversary of the library’s collaboration with Crowland Cares, which assists with operating the helpdesk every weekday morning.”
An anniversary competition will be running all week with questions on the events of 1974 when the library was opened.
All correct entries will be placed into a draw and the first drawn will win a hamper of goodies.