Sure;

USE ReportServer

DECLARE @SubScriptionID NVARCHAR(50)

SELECT @SubScriptionID = [SubscriptionID]

FROM [ReportServer$SQL2012].[dbo].[Subscriptions]

WHERE [Description] = '<your subscription description here>: you can use any other criteria, e.g. if you know the actual ID, use that'

EXEC dbo.AddEvent @EventType = 'TimedSubscription', @EventData=@SubScriptionID