Technically, you create a taxable event each time you make a trade.
Aye. I've been pondering this. I'd love to get rid of all my fork coins but the idea of having to wade through taxation shite because of it is more than I can be bothered with at present. I'll either have to swallow it or wait until I can be bothered, by which point they may be worthless which is still fine with me.
I've read quite a few people though who've consulted accountants in the UK whose accountants reckoned capital gains was only due when everything is converted to GBP. Others are adamant that any trade for any crypto is taxable.
It seems impossible to know who is right or wrong as it's case by case.