All, Blenheim opens for general entry this Friday but priority registration is now available.
For those who haven't done it before it is a wonderful event in a beautiful setting all within the grounds with a fantastic clean, non-weedy lake.
There are Sprint and Super-Sprint distances available.
Blenheim also have a great track record of attracting thousands of first-timers to tri (many with their panniers / baskets still attached!) so it's super-welcoming for anyone not quite sure whether they're ready to do their first event yet.
Personally, I also can recommend the Weekend Warrior, where the challenge is to complete as many Tris as possible in the course of the 2 days. Last year's winner managed 9!
W/W competitors get a red carpet treatment and create a super-buzz about the whole weekend.
And finally, there's also a Kids Duathlon. Maybe a kids team event.. ?