I don't like business angel associations where the business angels discuss in expensive hotels over a glass of champagne with each other and a few startups are allowed to present in the afternoon. This somehow reminds me of the gladiatorial combats in Ancient Rome or the kings and their entertainers in the Middle Ages.
And I do not like the startup events where a jury elects the best startup. The jury consists mostly of employees of the companies which pay the bills for the event. Critical are also huge events with papers and discussions. It is a logistic masterpiece to provide food and drink for a lot of people, but the entrepreneurs do not really profit. In many cases they have to pay entrance fees and have lost a few important days. It is not very likely that they find THE investor at such an event; or that you get the decisive idea for your own startup.