Yes, but with a caveat of Having Said That...
I've taken a particular interest in this topic because of the experience of
many of my friends and my time helping run conventions; I wrote the code of conduct
for this year's UK Eastercon, where I chaired a panel on the topic.
Whilst it's certainly true that flirting is not harassment, I have heard accounts of how tiresome and at times intimidating it can be to have it assumed that just because you are female and not obviously in the presence of a partner that you have come to a convention to meet men. (It seems that a lot of supposedly enlightened male con-goers forget that (a) not everyone is heterosexual, and (b) just because you are single does not mean that you are necessarily after a partner, short or long-term.) I think that there is a case for trying to get the message across that a convention is not a singles bar and that and that hooking up with someone is a nice possible outcome rather than an expected feature of the event.