The "major line of inquiry" is a firework display organised by Taunton Rugby Club.
BBC: M5 crash: Family's heartbreak for Tony and Pamela Adams
On 5 November the couple went to a firework display at the pub where Ms Mills worked, then went home.
The two-day festival includes family fun days, magic shows, movies and live music, and culminates in a firework display on the river.
Hundreds of people took part in the parade watched by crowds along the route from Monument to the Civic Centre where a firework display was held.
It has been named Sparks in the Park for about 10 years but a firework display has been held at Earlham Park for at least 20 years.
Meanwhile, thousands of people gathered in Red Square in Moscow to witness a firework display at midnight, although alcohol was banned to prevent the festivities getting out of hand.
Others suggestions included treating friends and relatives to a firework display by mixing the ashes with gunpowder, while some people wanted a small amount of their remains placed in a specially designed locket for their loved ones to wear.
The event was being followed by a midnight firework display on Tyneside's quayside.
The ashes of a soldier who died in Afghanistan have been sent up in a firework rocket as part of a display to mark the anniversary of his death.
From 21:00 on 31 December there will be a one-minute display on the hour until midnight where there will be a longer firework sequence.
BBC: Edinburgh Hogmanay: Hourly fireworks in countdown to 2013
The annual firework display held for several years near Norwich is to become a free event in the city.
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