I need some help/ advice/ knowledge from previous experience on how to keep kegs cool away from home at a party.
We are having a surprise party

Making and taking the ales is not a problem, but I am just trying to get my head around how to keep 3/4 kegs cool.
We are starting out trip to Leicester early in the morning and the party doesn’t kick off until the late afternoon. I was thinking of chilling the ales down to a degree for a couple of days prior to the trip and loading the car on the morning of the trip. I don’t think the contents of the kegs will remain cool for over 15 hours, or will they? Unfortunately, there is no fridge in Leicester in which I can store my brew between arrival and party. The only work around I can think of is to set the kegs individually or a couple at a time, in a couple of black bin bags and filling up the bags with ice and bungee tie the bag shut towards the top. Not sure how long that would work for or how much ice I may go through.
Anyone have any thoughts? Many thanks.
Paresh