Question re "women's congress" in May 1905

[Elena Gapova]

Dear all,

the biography of a Slavic woman-writer reads that, as a delegate for the
women workers of Wilno, she attended a women's congress in Moscow in May,
1905. The problem is, that the First All-Russian Women's Congress took place
in St Petersburg in December 1908. Does anyone know what kind of gathering
(congress, meeting) could be the one in may 1905?

e.g.

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