The first driver for a successful event or project, both in case of an ALEx Event, is to form a team and to find the right motivation to succeed together.
Working solo cannot give the same results than sharing time and experience with a larger team.
A good team needs to be competent, with a rich and diverse set of personal skills counting as general experience and specific knowledge about the project/event to be executed (in case of an ALEx Event, please study this handbook).
If you have already worked with your team on a different project, it will be easier to readjust a little and start working right away on the ALEx Event. On the other hand, if the team is new, it is always a great idea to begin with a team building activity, where each member of the team gets to know one another and gives a chance to the leader to assign the right tasks to the right person.
A leader was mentioned. There is no successful team without a leader capable of keeping everybody on the right track. A team can be as democratic as possible, but there is no orchestra without a conductor capable of seeing the whole opera and keeping the tempo. If you lack a true leader in the team, identify the most motivated person to execute the ALEx Event and trust them to be the leader you need.