Tynwald Day traders using card machines will be supported by Manx Telecom.
The company will provide extra coverage in St Johns on Monday to help with cashless payments.
Organisers say stallholders will be directed to reserved spaces off Station Road - and add there'll be no vehicle access to the Back Fairfield before 5pm.
You can find out more about this year's festivities here.
Bus services north and south face disruption later
Wildlife Trust unveils woodland plans
Deadline looms for by-election nominations
Biker in UK hospital after Mountain crash
Trial event closes roads in Peel and Ramsey
Requisition meeting for Garff voters
Castletown police station could be yours... for £250,000
Brewery advertising for operator for landmark Laxey pub