Which is correct:
1) Your debut in the World Junior Figure Skating Championship.
2) Your debut at the World Junior Figure Skating Championship.
Thanks for your help!
'Debut' as either noun or verb could happily take many prepositions, including both 'in' and 'at'. Which depends on context.
For a skater, either would work equally well.
For someone not competing, perhaps the host or master of ceremonies, interval entertainers, stewards or doormen 'in' would imply too close a relationship so 'at' would be much more appropriate.
A big cruise ship as venue for the championships would open up the possibility of 'aboard' or 'on' or many another.