The micromouse challenge was done since the 1980 in the context of university driven robotics research. The Robocup challenge has a similar approach and provides a competition for university students. Today, Robocup soccer is a regularly event which brings robotics to the mainstream. But there is small problem. Both competitions are not attended by amateurs, that means by non-students. The main reason is, that the task of controlling a team of Nao humanoid robots is difficult and costly at the same time. That means, the Nao robot is too expensive for amateurs and they are not overwhelmed by implementing vision, motor control and self-localization at the same time.
On the other a hand, a robotics competition is a great opportunity to learn from mistakes. The same task is done by others and if strategy A is working it can be copied. A robot competition is a great opportunity to learn something and in most cases it helps to form a community.
My question is: are some entry level robotics competitions available which have to do with reaching objective goals against other participants which are open for amateurs? Open means, that the robot is cheap and the task isn't very hard.
Are you looking for competitions anywhere in particular?
A competition can be held in real life, for example in a city. Or it can run online-only, that means the participants have to send their submission over a website from anywhere. I'm not sure, what the better idea is. offline competitions have the advantage, that a video can made from it, while online challenges have a lower price tag because the travel to the location isn't necessary.