[Sciencewoman]

If the informal recruitment events are open to all, and not invitation only, I would go. See what kind of a vibe you get. Students get busy and while you may be hyper-focused on them and trying to read a lot into what they're following through with or not following through with, they are likely going on with their busy lives and are not as hyper-aware of not following through with you. Or, it could be a sign that they're being polite but not super interested in you. You don't have anything to lose by going to events. Don't give off a desperate or overly intense vibe when you attend. Express sincere interest and thanks, but don't send texts that veer into being pesty.