N-Dubz star Tulisa Contostavlos is accused of setting up an £860 deal for 13.9 grams of cocaine to an undercover reporter.
She has denied the charge at Westminster Magistrates Court.
She appeared alongside rapper Mike GLC, also known as Michael Coombs, who denied a charge of supplying the drug.
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The world's first ever 'hole in the wall' was installed in Enfield, north London, on June 27 1967.
America says it has "identified preparations" for an attack similar to that which killed at least 86, including 30 children, in April.