It appears that the U.K. will start accepting U.S. vaccinations in a few days, so I am again planning a European speaking trip, probably starting in about a month. I expect it will either start or end in London, since it's an easy city to get to from the U.S. and I usually have at least two speaking invitations there. I usually spend two weeks on a trip.
My standard terms are expenses; I have no objection to an honorarium but don't require one. Mostly I want an interesting audience in an interesting place. I am only interested in countries that accept U.S. vaccination or don't require vaccination.
P.S. I have decided to postpone the trip, given that infection rates are going up in the US and UK and the amount of protection against Delta provided by vaccination seems uncertain.