U2 is poised to take on the world yet again with its upcoming 80-show arena tour, set to begin March 24 in Sunrise, Fla., and run through a June 21 date in East Rutherford, N.J., before hitting Europe. Tickets for some shows will begin going on sale this weekend through all Ticketmaster outlets. The trek is being dubbed as the "Elevation 2001 Tour," named after a song on the Irish rock act's new Interscope album "All That You Can't Leave Behind," which debuted at No. 3 on The Billboard 200 last fall.C