I was wondering if there are websites that organize scientific conferences dates, locals and subjects in order to facilitate the search of such events, depending on our field of research.
There are thousands of conferences, and there are hundreds of conference lists for different fields. There is no complete list. E.g., I maintain a list of conferences related to Earth rotation, refererence frames and similar (https://www.iers.org/IERS/EN/NewsMeetings/ForthcomingMeetings/forthcoming.html), as well as two lists of meetings lists for geodesy (https://www.iers.org/IERS/EN/Links/Geo/Geodesy/Meetings/meetings.html) and astronomy (https://www.iers.org/IERS/EN/Links/astro/Meetings/meetings.html). For your field, I recommend to make an Internet search with the name of your field and keywords like "meetings" or "conferences". This way I found a lot of lists for my own fields of work.