Restore iCal from Time Machine - (Lion)

Should be easy - but not for me.

I fell into the trap - upgraded iPad, then synced with the MacPro and somehow some of my bookings got deleted.

(At this stage, I found out how to backup iCal from within the app).

Should be no problem - I meticulously ensure everything is backed up with Time Machine - so no problem at all - but I was forgetting.

For some obscure reason, there's a little (secret?) application of the Option Key required to reveal the Library folder in 'Go'. I cannot seem to replicate this when in Time Machine, so my question is, how do I access my Time Machine backup of iCal so that I can restore it?

Andy