Not exactly what you're asking, but would be interesting to a gardening group - Plantlife Charity looks after wild flowers both here and also linking with similar groups in Europe. They used to send speakers to do a very interesting presentation on wild flowers, the problems they face, their uses, successes in bringing species "back from the brink" and so on. They had speakers in most areas of the country and covered travel expenses themselves. I did a number of presentations round my area and they were very well received - ask them if they still do this

Plantlife