[RichardFG435]

if the companions and sahaba didnt do it, it doesnt mean its haram.

It means it is mubah, or allowed, unless and until you can find something that does not allow it.

Does, celebrating the milad is fine. What is not good, is all the other stuff that comes with it

All the mixing and flirting that sometimes goes on between the men and women is not allowed.

And the belief that certain activities will get you heavenly reward is what is bidah.

Note that there is a difference between the two. All bidah are haraam, not all haraam things are bidah.

Bidah is mainly to do with aqeeedah - a thing becomes BIDAH, when you believe doing it will get you reward.

Sending salaam to the prophet standing up is not bidah. However, believing that standing up gets you more reward IS a bidah.

hope this helps. You've probably been confused my too much intermingling with the salafis.