axolotl
I am hesitating whether to attend the Welcome Event. The flight ticket is more than 500 euro.
I think it is definitely worth it. The Winter Welcome Weekend was a ton of fun (and informative), the Spring Welcome Weekend is usually more than 2x as big. It's also a great opportunity to find a good apartment, as opposed to doing everything over e-mail and not truly seeing what you got until you move in.
Also if you want to get into one of the higher demand places (e.g. 1500 Locust) can't hurt to throw your deposit down earlier, I'm sure the studios/cheaper apartments go early.