Thousands rolled up to Classics on the Green in Croxley in what organisers have called the "most successful" mid-week event yet.
Hoards of cars, scooters and even a penny farthing cycle turned up to the popular event on Wednesday, which began at 2pm and ran until about 11pm.
The event was such a hit with motor enthusiasts that organiser, Kevin France, director of Watford and District Classic Vehicle Trust, said the show is becoming too big for the site.
He said: "I think it’s the best ever. Although we’ve had a little lesson learned - the show is now bigger than the site can hold as the site was full at 6pm.
"It was the most successful event we’ve held and there were as many people leaving from 6pm to 8.30pm as there were arriving.
"As a car show we couldn’t have asked for better."
Mr France was very impressed with the range of vehicles that turned up to the show, many of which he had not seen before.
When asked when makes the mid-week car show so popular, Mr France said: "I think it’s a giant social occasion. It’s not a car show in terms of just going round to look at cars.
"People go there to chat with each other and meet up with people and the sheer volume of cars coming off the site was huge."
Heather and Martin Taylor travelled from Abbots Langley to attend the car show.
Mrs Taylor said: "It’s just so different. I think it’s more special because it’s on in the week and it’s a really nice thing for people to come to after work - and it’s the school holidays, which helps.
"It’s just so busy and I think it’s so popular because there’s that revival thing going on now and I think people respect that these people have looked after these cars for so long."
Caroline White and Peter Scholey left their Volvo Amazon sitting in the garage at home for 20 years before they decided to exhibit it at the this year’s show.
The couple set a target six months ago that the car would be ready for Classics on the Green this summer and they worked "day and night" to achieve this goal.
Organisers are still counting the amount of money raised, but Mr France is estimating the show brought in between £4,000 and £5,000.
The donations will be split between a number of local causes, as well as Leukaemia Research, Breast Cancer Care, Diabetes UK, Sue Ryder and the Michael Sobell Hospice.