I don' really have any 'loved ones', other than the guy who I think of as my own son. (Long story!). He got married in a registry office.
I'll occasionally attend a church wedding but, as an atheist, I feel uncomfortable doing so. (I have no contact with my only cousin on my father's side nowadays but, in the days when I did, I attended his deadly dull very old-fashioned C of E wedding; for an occasion which was meant to be a celebration, it was totally lacking in any sort of cheer. My many cousins on my late mother's are all 'happy clappy' Baptists; at least their weddings are cheerful events!)
I've never been invited to a christening (and I'd probably refuse to attend if I was) but, by the very nature of the ceremony, I'd expect any christening to be held in a church (or, a least, to be presided over by a Christian minister). Atheists don't have christenings!
I generally refuse to attend funerals, religious or otherwise, as I simply don't see the point of them. I got coerced into going to my uncle's funeral at the beginning of last year though, which was held in a church. I felt totally out of place and, at the end of it all, still regarded the whole thing as a totally pointless exercise. My own will states: "I desire that my body be cremated without ceremony and that my ashes be disposed of, also without ceremony, in any convenient refuse receptacle".