Manx nationalists claim a decision to cut the number of grandstand seats for this year's Tynwald Day shows people are less interested in National Day.
In a post on Facebook, the Celtic League says a decline in people wanting to sit through the annual ceremony means the event is getting less attention from the public.
It claims photos from past events shows fewer people have been attending over the last decade.
And it accuses Tynwald Day of degenerating into what it calls "a cross between a medieval pageant and a funfair".
Northern bus services to be raised in Keys
Ben out of service for maintenance work this week
Richmond Hill closed again tonight for work
October warmer and sunnier than usual, says Met Office
MHK queries cost of Liverpool awards trip
DOI says it has 20 empty public sector homes
Marquee plan submitted by Milntown Estate
Fire crews called to free driver from crashed car