Leaving Cert students are being warned about a fake Facebook event advertising a festival in Marlay Park.
The event page advertises a bogus Leaving Cert results party and has over 3,000 people indicating that they will attend.
Fine Gael Senator Neale Richmond, who said he has reported the page to the Gardaí, says the event is a scam and students should not buy tickets or turn up on August 17.
"It appears to be a very legitimate and professionally organised event," he told RTÉ.
"However, Dún Laoghaire-Rathdown County Council has neither received any applications to stage such a festival, nor has it granted a licence for one.
"This event is a straight up scam, looking to extort money out of young festival goers who associate Marlay Park with existing, legitimate concerts that are very popular and bring great excitement to the area in July."
A spokesperson for Dún Laoghaire-Rathdown County Council confirmed: "The Council has not given, nor will be giving, any authorisation or licence for such events in any of its parks."