differences - Spelling protocol (American/British/Canadian) for an International conference

If I'm a Canadian who'll be presenting in an international conference, should I use my country's spelling, which is the Canadian/British spelling like "grey" or the more used American spelling like "gray?"

We also have our own unique spelling for some words, like "centre." I know Americans spell it "center" and I think the British spell it like the Americans.

Things to keep in mind:

• I don't know the distribution of the audience.


• The conference will be held in Germany, which isn't an English-speaking country itself.

Is there a protocol for these sort of situations?

P.S. This is a science conference, but I'm curious if a certain protocol exists.