[go] on a picnic

to have an outdoor meal or gathering in a natural or park setting

They decided to go on a picnic in the nearby park for a family outing.
She invited her friends to go on a picnic by the lake.
Let's plan to go on a picnic and enjoy the beautiful weather.
She packed a basket with sandwiches and snacks to go on a picnic with her partner.
Going on a picnic is a delightful way to spend time outdoors with loved ones.