The annual Trinity InterVarsity took place over the last weekend in January. The IV consists of an "Kingsmill-Moore Invitational" (held on Thursday) and the "Dean Swift IV" held on Friday and Saturday.
The Final motion for the Dean Swift was "That Dueling Should be Legalised". Photos and audio recordings of this final can be found here
The Hist website is actually a good source for audio podcast type recordings of their debates.