"If you see something, say something, " Mark Boughton, mayor of Danbury, Connecticut, wrote on Twitter.
The Boughton family was originally from Wednesbury before they moved to the Herefordshire-mid-Wales border.
Ms Boughton's younger sons were seriously injured in the accident, but are now recovering at home.
The three-day event in July is moving from London to Boughton House, the home of the Duke of Buccleuch.
The Boughton Estate is known as the the "English Versailles" because of the magnificent gardens and Grade I-listed park.
If the event is a success, Boughton could become the festival's permanent home.
"We would struggle to find somewhere as accessible as Boughton to as many people in the country, " said Mr Hemingway.
Vintage, which celebrates British fashion and music from the 1920s to the 1980s, will be held at the Boughton Estate near Kettering.
Lancashire Finds Liaison Officer Dot Boughton said the hoard was "very significant".
Mary Boughton, of the Dorset-based herbal medicine specialists, Dorwest, said her business had already lost money as a result of the VAT change.
Former Met Police chief Lord Blair of Boughton argued that the change should not be allowed to proceed without primary legislation and full parliamentary scrutiny.
It will leave Chester for Boughton, Winsford, Northwich and Ellesmere Port.
After Mr Webster reported his find to Ms Boughton, she identified it as Viking silver from the early medieval period, before passing it on for analysis.
Kate Boughton, 35, and her son Samuel, 13, lived in Combe and died in the accident on the B4362 in Lucton near Leominster, on 14 February.
Docking stations will include the university campus at Boughton Green Road, the railway station, the entrance to Beckets Park, the Skatepark at Midsummer Meadow, Brackmills and the new bus interchange.
Gaming on mobile touchscreens isn't nearly so tactilely pleasing as that portable, however, so nostalgic modder Chad Boughton decided to swap out his GB's dot-matrix display for the Super AMOLED of a Galaxy Nexus.
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