I rang the library today as e-mail hadn't worked.
They are quite happy for me to bring the pack but have said that they don't think the childrens' librarian will be available in the evening to do anything with us so it'll be up to us to think of fun stuff to do in a library. I think I can manage that but any suggestions of course will be gratefully received! My current thinking is a treasure hunt using the books - spine numbers and clues from pages hopefully. I have the day off so should be able to do it in the afternoon (which will reduce the risk of anyone checking the books out before we arrive).
Tonight our plan is: Start off making pictures of themselves doing activities they enjoy at Brownies for a display on the wall (result of comment from rainbow leader that their wall is better than ours. Not for long, lady!). Then we have easter nests to make - that's really easy so it should be pretty quick. Followed by an egg and spoon race if there is time.