Partying like it’s 1971 will mean different things to different people, depending where they are demographically. No matter the age, however, Hard Rock Cafe Honolulu invites all to its birthday on Tuesday with a ’70s-themed party, cake, balloons for the kids, gifts with purchase and specially priced burgers.

Head to Hard Rock between 10 and 11 a.m. for a sit-down, as the restaurant and shrine to rock music opens an hour early for its birthday, and get one of their Original Legendary Burgers for just 71 cents. The regular price for the burger is $13.95.

From 11 a.m. to closing, civil servants with proper identification get any of the cafe’s Legendary Burgers for 71 cents, in Hard Rock’s tradition of showing gratitude to those who serve the community.

Birthday cake will be free while it lasts. Entertainment will be provided by rockers the Piranha Brothers from 9 to 11 p.m.

Americans Isaac Tigrett and Peter Morton opened the first Hard Rock Cafe in London on June 14, 1971, and it became the foundation for a global brand.

Music legend Eric Clapton asked to hang his guitar in the place, a converted Rolls-Royce showroom, giving Tigrett and Morton the inspiration to combine music, memorabilia and food to tie the concept together.

There are now 164 Hard Rock Cafes, 23 hotels and 11 casinos bearing the brand name in 68 countries.

Hard Rock International hosted more than 31,000 live music events in 2015.