Today a group of people visited my office (I work at a documentary production company). They work for a museum in town, and we were showing them our facilities and our work. It was a meet and greet, pretty frequent in the business. Sometimes they turn into new clients, but most of the time, it's just showing folks around.
Among this group were a couple of people with whom I seemed to really hit it off. A lot of similar interests, and they seemed impressed by my work. At the end of it all, we exchanged business cards and parted ways.
I'd like to write one of them, and see about meeting again. I don't think it's a problem since there isn't a business relationship in place, and they were just visiting, but the visit itself was in a professional capacity. And I want to respect boundaries and practice good professional decorum.
Is it appropriate for me to write, an email perhaps? How do proceed?