What police have described as a 'large fight' in Maughold on Friday left a man needing hospital treatment.
Police say the scuffle broke out at a house party at the lighthouse in the village.
Ramsey police are calling for people who were at the party - which carried on into the early hours of Saturday morning - to come forward.
Call them on 812234, or police headquarters on 631212.
Rearranged FC Isle of Man vs Prestwich Heys tie cancelled
Visiting team fails to attend for morning kick-off
Island at 'forefront' of British Isles blue carbon research
Manx waters researched over four year programme
Five comments and objections received over Ramsey flood defence scheme plans
But DOI says a number of informal objections received before plans withdrawn
Water main upgrades planned in Foxdale from next week
Works aim to improve reliability and reduce risk of bursts, with some temporary road disruptions expected