Qur'an and sunnah are the two source of guidance for every muslim. is that not? then from which of these two do you preach that teberuk, tewesuland mewlid are activities not forbidden in islam? if for example we take mewlid:
1. it was not celebrated durig the life time of prophet(pbuh)
2. it was not celebrated by the companions of our prophet(pbuh) who are the best generation as it was proved by the saying of our prophet(pbuh)
in addition the two we mentioned above were not practiced by them. but there are some exception for our prophet(pbuh) only when he(pbuh) was alive.