SJ i have heard that too that JW's dont celebrate birthdays or christmas- but i hadnt heard of them exchanging gifts on parents anniversaries. I think it has something to do with not rewarding themselves or something... not 100% sure.
We don't celebrate different holidays for different reasons - generally because they were not instituted by Jehovah or Jesus. Having said that, we do have a similar celebration to Easter, based on instructions at Matthew 26:26-30.

OK - a question now that may bring this thread back to the original topic.. if the bibles are not significantly different.. how come the beleifs can differ between christian and JW- unless the exact words have therefore been interpreted differently????
At times they have been interpreted differently, and some beliefs don't come from the Bible, but were instituted by others along the way. I think the Catholic bible has some extra books to ours, I'm not 100% sure why. I'll hafta research it and come back!