过年 specifically refers to Chinese New Year (春节, Chūnjié). It's the most important holiday in China, when families reunite for a big dinner on New Year's Eve (除夕, Chúxī).
culture
Traditions include giving red envelopes (红包, hóngbāo), setting off fireworks, and watching the CCTV Spring Festival Gala (春晚, Chūnwǎn).
