The Queen received a standing ovation from the 2,000 guests at the indoor concert Twelve people have been arrested on their way to an event being held for the Queen at the convention centre in Dublin.
Irish police said the 11 men and one woman, who were stopped near Connolly Station, are known republican activists.
Rockets, flares and other fireworks along with bottles, fishing leads and other potential missiles were found.
Police believe these were to be used during protests on Thursday evening.
Similar missiles were also thrown at Gardai (Irish police) near Dublin Castle on Wednesday night and near the Garden of Remembrance on Tuesday.
The twelve were detained under public order legislation and are due to appear before a special sitting of Cloverhill District Court in Dublin on Thursday evening.
Around 2,000 guests have joined the Queen and the Irish President Mary McAleese for an evening of fashion, music and theatre.
A fashion show featuring Irish and British designers was held before a concert got under way.
The Chieftains, Westlife, Mary Byrne and a host of other performers, including 1996 Eurovision Song Contest winner Eimear Quinn are performing for the Queen.
Earlier, the Queen visited the National Stud in County Kildare.
She met students of the Racing Academy and some of the people who trained winners from this year’s Cheltenham Festival.
The Queen was also given an inspection of some of the leading stallions at stud.
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