American Chamber of Commerce In Poland issued the following announcement on June 16.
Only two weeks left until AmCham's biggest and most fun event of the year! On June 29th the AmCham community will celebrate American Independence and 100 years of Polish-U.S. relations. We hope you will join us at the annual picnic for live music, great food, ice cream, drinks, valuable raffle prizes, a laser show, kids' corner and much, much more!
This year we are proud to announce that we are making this event as ecologically-friendly as possible, with a laser show instead of fireworks and eco-friendly plates and cutlery
Original source can be found here.
Source: American Chamber of Commerce In Poland