Jump, jive and swing to the music of the Beantown Swing Orchestra at a 1940s-style swing dance. Dance Lessons (free instruction with ticket to the dance) starts at 6 pm, and the band boogies from 7 pm to 9 pm. Then watch the Portsmouth fireworks display from the vantage point of Strawbery Banke. Tickets are $20. Sponsored in part by Cambridge Trust Company of New Hampshire.