From the train station: Take the bus n°11 or n°16. Stop at "Place de la Victoire". It is also possible to walk (20mn).
Then walk following this map.
Of course there are taxis at the airport and at the Train station "Gare Saint-Jean".
Tickets
You can buy tickets (called tickarte) in machines at the tram stations.
You can use them in the bus as well as in the tram. A same ticket is
valid during one hour, but you need to "composter" each time you get in
the bus or the tram.
From Victoria Garden to the tram station "Bergonié"
See this map.
Then take Tram B, direction "Pessac Centre", station "Forum".
From "Forum" to Institut de Mathématiques de Bordeaux (IMB)
Follow this map.
Conference diner
See this map (40 rue Lamartine).