The last event I was at was the special October version of Indian Wells last year. We have a friend that owns a huge 5 bedroom mansion in one of the gated golf communities nearby that let us stay for free, so we were there from qualies through to the final. Because of the vaccine restrictions and the unusual timing, the crowds were smaller and the tickets were super cheap. You could often get resold tickets for far less than face value or even the price of a grounds pass. That was at least the 4th time I've been to the Indian Wells tournament and I've never been disappointed. It's the best event in my opinion.
We usually go to a pro tournament every other year or so. In the past, aside from Indian Wells, I've been to pro events of different levels (challengers to M1000s) in San Jose, Palo Alto, Vegas, Hilton Head, Miami, Orlando, Portland, Seattle, Dallas, and Vancouver (most of which are defunct now or have moved to other cities). I've also been to the US Open, Wimbledon, Roland Garros, and the Davis Cup finals (back when it mattered). We have plans to go to Australia in 2024, which is by far the hardest to reach, but will be a bucket list item.
I feel super fortunate to have seen as much pro tennis as I have, including getting to both meet and watch the Big 3 up close, along with numerous other Slam champs from the past like Agassi, Sampras, Moya, Courier, Roddick, Murray, Wawrinka, Del Potro, McEnroe, Connors, etc.