There are many conferences in different countries, some of them are strongly related to our speciality. Some others are related a bit less but the participation may help in broadening the views.
Is it normalized in research organization? It is not, to my knowledge, in France. The important conferences are sometime far away and one has to finance somehow the travel and hotel.
One researcher should not present the same work more than once in any conference. If he has, say for example, five new research work he can participate in five conferences in the same year if fund permits and other researchers are not deprived.