Braxton will join the agency on 30 November and will be responsible for developing its live communications offer.
Her previous roles include vice president, creative communications, EMEA at BCD Meetings & Incentives and head of production at Talking Point.
Braxton appointment is part of an ongoing expansion at Acclaim, which has appointed two producers, three event managers, a creative director, designer, logistics manager, registration manager and two project coordinators in the past six months.
Acclaim will continue to recruit in the new year.
Acclaim managing director Simon Hambley said: "Good people make great agencies. We are extremely pleased that Kate has chosen to join Acclaim. Her energy and passion for this industry is infectious and she will play a key role in our future plans."