Start with a small gathering
Say how many people you hope to meet, roughly when and for how long. A daytime picnic in a busy park works well for getting acquainted. Mention whether you want games or just conversation.
An invitation to adaptA two-hour picnic on Sunday afternoon, with two or three people. I can bring a blanket; everyone brings their own snack. We can choose the park and time together.
Share the preparations
Agree who brings a blanket, water and rubbish bags. Everyone can bring their own snack; agree a shared menu and budget first if you prefer one. Ask about dietary requirements without expecting personal explanations.
Check the park and the weather
Look for a permitted picnic area, toilets and a clear meeting point. A park listing does not imply permission to barbecue. Check local rules and agree whether rain means rescheduling or meeting in a café. Take your rubbish home.