Ah, 30 is easy! Weirdly, I can remember what we did for DP's 30th, but not for mine... these days middle aged is not til 55 and old is not til 85 by my reckoning, we've all got ages to go
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hop, think of it this way, you'll be working for the next 40 years. Retirement age is going skywards, and unless you're a millionaire you'll have to work for quite some time..but you've only got another ten or so for the babies.
Wishing you loads of luck aethel, you won't need it as I bet anything you'll have a huge amount of fun with the DDs, and DS will love it too. Keep us posted on what you get up to!
See Oi, I'm so bloody atheist I can't even work out which day christenings are held!! Dab your eye with a large tissue when they read out the name, in an 'overcome with emotion at the whole event' kinda way, it will cover the snicker if you do it right 
It's been crisis central here, DP only just got to nursery in time to get DS at 7pm due to an actual kick-off at work that needed writing up, and one of my members of staff has gone awol with a personal crisis. Have managed to exchange texts at least.
Must crack on with dinner now, good thing I nibbled at one of DS's Easter eggs otherwise I'd be famished 