the summer solstice

Hello Alan, Mister Micawber, Beeesneees, Mordant, Esl_Expert and other native English speakers,
Many were headed to the Fiesta de San Juan, which celebrates the year’s shortest night, on the beach at Castelldefels.

Is “the year’s shortest night” called the summer solstice?

Yes. June 21st is generally regarded as the summer solstice in the Northern hemisphere.

Many were headed to…
Many headed to…
Are both of these correct?
Thank you.

I would use ‘many were heading to/for…’

Thank you, B.