Hire a Jazz Band 

Music8 have a great selection of vintage bands, speakeasy bands and jazz bands for hire which includes masterfully talented musicians in a range of jazzy genres, from classic Golden-Age Jazz to postmodern-jukebox-style vintage covers of modern hits, and from big brass bands to intimate speakeasy singers.
https://www.music8agency.co.uk/hire-a-jazz-band-or-vintage-band.html