Cinco de Mayo is probably the holiday celebrated that no one understands. Why do we celebrate it? What is it all about? Basic info about Cinco de mayo is that they are celebrating the Battle of Puebla witch took place in year 1862 on the fifth of may. The french came in and then lost. Mexicans stand united on this day and here at the Hard Rock Cafe Oslo we want to Celebrate that with a weekend filled with what the mexicans like the most. So come and join us on this day 2-3 of MAY you will have Mexico in Hard Rock Cafe Olso.