From tomorrow –

“Edinburgh-Dundee service – 2352 on Friday and Saturday nights from 3 to 25 August.”

https://www.scotsman.com/news/transport/scotrail-adds-more-seats-to-edinburgh-festival-trains-to-cope-with-demand-1-4776223

Trains will stop at all stations to Dundee, eg http://www.realtimetrains.co.uk/train/M18650/2018/08/03/advanced

(Photos taken on Bonfire/Fireworks night last year. What chance of extra coaches on November 5th this year?)