What is the best month to go to Boston?

I'm planning a trip to Boston, but I'm not sure when the best time to go is. Could you tell me, what is the best month to visit Boston? I've heard that some months are busier than others, and I'd like to avoid the crowds if possible. Is there a specific time of year when the weather is particularly nice, or are there any events or festivals that take place that would make a visit more enjoyable? I'm looking for a balance between pleasant weather, fewer crowds, and potentially interesting events to attend. Any insights you have would be greatly appreciated!