Touring exhibition on Anne Frank in a school in Šibenik was closed after school principal objected to some of the exhibits.
The NGO covers the plaque with a letter.
The main issue is whether to ban Communist symbols such as the red star, which is also a symbol of antifascist struggle during the Second World War.
At issue is a war memorial which has recently been unveiled in Jasenovac.
During the sermon at the Sunday morning mass broadcast live on public television, priest Luka Prcela defends the Ustasha state.
Culture Minister Hasanbegović unexpectedly comes to the presentation of a book written by author Slavko Goldstein.