DUBLIN — In a landmark judgment, the Irish Supreme Court has permitted U2′s Dublin concerts to go ahead on Aug. 30 and 31, after an earlier attempt to host the homecoming gigs in the capital was refused permission on the basis of planning regulations.An objection lodged by local residents, claiming that an event of this nature was an “unauthorized development” and “material change of use” of a sports stadium for a music event, was granted July 28 in the High Court. But on Aug. 1, a unanimous Supreme Court overturned the High Court, deciding that the regulations didn’t apply to events which hadn’t yet taken place. Dublin’s 42,000-capacity Lansdowne Road sports stadium sold out both dates within two hours of going on sale in July. Although the band had played here in 1983, there had been a racetrack pavilion with food and toilet facilities in existence then, which has since been demolished. U2′s European tour kicked off July 18 in Rotterdam. The 20 dates in Europe are part of a worldwide 80 date tour in all five continents.