The annual celebration of creative excellence will no longer accept entries after Friday, 8 July, which is the final late submission deadline.
The Big Awards winners will be showcased at an awards ceremony at Grosvenor House on Wednesday, 19 October.
Last year's winners included Adam & Eve/DDB, which was the outdoor agency of the year and press agency of the year. The Omnicom agency was also awarded a Gold in the retail category for "Monty's Christmas" (above), its 2014 festive campaign for John Lewis.
Wieden & Kennedy London was awarded digital agency of the year and won a Gold in the automative category for Honda's "The other side".