Come to events and support their efforts. If the event is ticketed and you can’t afford the ticket price, see how you can help out behind the scenes. I have friends who showed up for me at my children’s events who don’t have kids, but sat behind the registration table, helped me carry things, and were there to just give me a thumbs up when I needed it.
There are so many ways that you can lend a hand at events including taking photos or video of them speaking or presenting, and emailing them. You can catch moments that they can’t, and your vantage point, whether it be behind the scenes or in the audience can help them to refine their presentation.