There is nothing wrong in the absolute sense with
organizing Mīlād gatherings. It all depends on what is read in the Mīlād and
what the intention is while reading it. If what is read does not go into the
realms of polytheism (as it does on most occasions) and the intention is just to
offer Du’ā for the Prophet (sws), then this cannot be objected to. It is
commendable to read about the life of the Prophet (sws) and remind one another
of his character, for his life is a role model for all of us.
The other thing is that Mīlād was non existent in the early
times; so you will not find any Hadīth dealing with this subject.