Shane Gillis (Parx, April 29 and 30): Gillis was fired in 2019 from the cast of “Saturday Night Live” just days after his addition to the show was announced when racist and homophobic slurs he made on podcasts came to light. And if past performances are any guide, you can expect a lot of new material. Jerry Seinfeld (Borgata, April 22): While his eponymous, career-defining sitcom ended its run almost 25 years ago, Seinfeld continues to be standup-comedy royalty.