Going to concerts alone can seem intimidating at first but when you think about it, you will be around many people with the same interest as you. Going to a concert alone can be one of the most fun things you will do.
Some of the best summer concerts you will see will still be the best if you go alone. Some summer concerts are free and the environment is usually relaxed so going to a summer concert alone is a nice cheap way to spend an evening.
You can see some of the best rock concerts alone too. Even if you go to a concert alone you are not really alone. At a rock concert you are surrounded by hundreds of other people that are interested in rock music, and more specifically the same band that you are.
Live comedy shows are another event you can always attend by yourself. If your worry is that someone will judge you for being alone, chances are they will not even notice. They will be too busy paying attention to the performer. Taking yourself to a comedy show is a cheap date. You can find cheap comedy tickets even cheaper if you are paying for just one ticket.
There should never be any shame in going to concerts alone. You should try it out sometime, you might like it.