Stag Republic and Hen Nation, which is based in the Hungarian capital of Budapest, is using BGB Communications to emphasise "the local knowledge" it provides.
"The company is clearly aimed at helping people to have a good time, but there is more to it than that," said BGB director Adrian Leighton, who reports to the company's Texan founder Josey Walker. Leighton added: "It is also about promoting other local activities that are available as well as its safety advantages."
Seventy per cent of Britons' stag and hen weekends now occur overseas, according to a Foreign and Commonwealth Office estimate earlier this year.
The FCO said people on a quarter of stag parties abroad have to contact a consulate. Last month it announced plans to charge £84.50 an hour for assisting those in trouble.