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Where do you find the info about what tournaments guys have entered?
For Futures tourneys, go to the ITF website (the International Tennis Federation). Click on "tournaments." That'll give you a list of all Futures tourneys in any given month. (There's a LOT of them all over the world). Pick a tournament - for Chappell, Rybo, Nava and Stalder, it's usually the U.S. tourneys (but not always as Rybo and Chappell get around), for Escobar Colombia, for Nunez Chile (although he does U.S. tourneys too), for Gray any European tourney (although he's played all over Asia too). If it's 2-3 weeks in advance, click on "entry list" or "acceptance list." That'll give you a listing of those who are in the main draw, in the qualifying draw or are alternates. It's done by #ATP rating. This is the way all pro tennis players actually enter the tourneys - many "enter" and then subsequently withdraw and the lists change daily. There's also player pages where all activity is listed throughout history. Once the draws are set, upcoming matches will be listed on the players' page - for example, Stalder is playing Yancy Dennis (a South Carolina player) today in Winston-Salem. Then, if you want to follow the match live, go back to the "tournament" page and there's also a "live scoring" link.
For Challenger tourneys, it's different. And if you want to follow Cam, it's a must. You go to the ATP Challenger Tour website page, pick a tournament and similarly click on the "live draw" pages (the tourneys vary on their format, so it's not always the same). For Cam, you can also go to the Brit Tennis website and on their forums, others who have already researched what Cam is up to (he's become very popular in the U.K.) will just tell you and you can skip all the research and just rely on them. You can also go to the Challenger tourney's site and they will also usually have a "draw" link, so like when Cam went to Maui, they will list that sometimes sooner than the other sites will. For example, Cam just finished at Surbiton but is headed next to Nottingham and Manchester (if he doesn't get a Wimbledon qualie wildcard, which according to his many UK fans, seems likely) - just click on the links for those tourneys.
You can also go to the various betting site websites (mostly in the UK where betting on tennis is legal and widespread) and every single match will have its separate page and they follow all matches and tourneys live. I forget the names, but I think there's a "sofascore" and a few others. You just have to google, for example, "Reese Stalder v. Yancy Dennis" and several sites will pop up.
For ATP World events, it's like the Challengers, but it's a different page. So far, no TCU player is at that level, but Ashley Fisher and Esteban Carrill used to be before they retired. Maybe Cam will get there soon. Because he's British, he got wildcards into Surbiton, Nottingham and Manchester - there's no real listing for those, I usually only find out about them by reading the Brit tennis site.