Top Level Program with class

Program.cs

using System;

var glasgowMeetup = new Meetup("Glasgow", "Umbraco");
Console.WriteLine(GetMessage(glasgowMeetup));

string GetMessage(Meetup meetup)
{
    return String.Format("Welcome to the {0} {1} meetup!", meetup.City, meetup.Topic);
}

public class Meetup {
    public Meetup(string city, string topic) 
    {
        City = city;
        Topic = topic;
    }
    public string City { get; init; }
    public string Topic { get; init; }

}