I would start with mentioning Jason BeKind Lemkin. You can find Jason on twitter under @jasonlk. Jason is brilliant and great at hosting many conferences, through out the year. There are many investors and entrepreneurs at these conferences. Jason connects them, and many times, merger and acquisition happens, just by being invited to such events. These conferences are not free. If you are looking to sell your company, the price you pay is very small. However, you have to be prepared. You need to have your pitch ready. You should have already closed some sales cycles. To convert a deal, takes a special confidence. You have to be ready to make decisions. You must have already discussed this with your team. Your team is perfectly in sync with each other. Once the buyers come in, there will be little time to practice pitching. Investors don't like confusion and personal issues. Stick with facts and metrics, data to support your conclusions. I would also add Keiretsu Forum on this list. You can find them under @KeiretsuAngels on twitter. Keiretsu Forum is the largest angel investor in the world. Randy Williams is the founder and I personally know Randy for over a decade. If your startup can return on investment, 10% year over year for 3 years, they will invest unlimited amount in your company, or you can exit, sell your company in 3 years.