I don't think that companies will allow seminars with their company that is not connected to their business. Seminars inside the companies are not 100% sure will introduce bitcoin to local people, not all companies will allow that, because as long as they will not benefit by that seminar they will not waste their time to do seminars that they don't know if that will increase their profit.
With the proper arrangement and proposal for sure some companies will allow it, or if not, why not conduct a seminar in public, let's say in a public plaza where there's a lot of local people that can attend. Anyway, hope there will be a group for each country that will initiate some blockchain seminars and events where people can freely ask too, as of the moment, there are seminars but they are just making a brief info about Bitcoin as they are more focus on their platform.
I dont know if people will go even it will conducted on public plazas, most of them are not interested with tech and most of them who were on that place are only looking for leisure and pleasure maybe it is better if there will be an organization who will conduct a free seminar and it will be conducted on universities and colleges that is much effective.