Keep in mind that, even though Ireland is an EU member, it is not in the Schengen Area. Even if you hold a Schengen visa, you still need to obtain an Irish one.
You can take advantage of the Short Stay Visa Waiver Programme. It allows holders of short-stay UK visas to travel from Britain to Ireland without a visa, and vice versa. Use this opportunity if you want to attend BIFD and visit the UK as well.