Saturday-Sunday. Colorado is firmly landlocked, but that doesn’t mean we can’t go scuba diving: Give scuba a try when the traveling “Be A Diver!” program visits the Downtown Aquarium. Featuring a heated, 15,000-gallon mobile pool, “Be A Diver!” lets anyone go for a quick dive with the help of a certified scuba instructor. Best of all, the “Be A Diver!” dive is free of charge. It’s all part of the aquarium’s special Shark Weekend — don’t worry, there won’t be any sharks in the scuba pool. 10 a.m. to 4 p.m. Saturday and Sunday. The Downtown Aquarium, 700 Water St.; 303-561-4450. Admission to the aquarium is $15.99 for adults ages 12-64, $14.99 for seniors age 65 and older, $9.99 for kids ages 3 to 11. Visit aquariumrestaurants.com for more information.

Saturday. Kick off the Boulder County Fair at the Boulder County Fair Parade. The fair doesn’t officially begin until Tuesday, but they’re starting early: Fill up for the morning at a pre-parade chuckwagon breakfast in downtown Longmont, then grab a seat before the parade steps off at 10 a.m. The full Boulder County Fair will be up and running on Tuesday with rides, rodeo, livestock shows and much more. The fair runs through August 7th. 6:30 a.m. to noon Saturday. Downtown Longmont. Admission is free. Visit bouldercountyfair.org for more information, including a complete schedule of fair activities.

Saturday. Do the Highland thing at Cherokee Ranch and Castle’s “Céilidh at the Castle.” Pronounced “kay-lee,” a Gaelic céilidh is simply a community gathering, often with music and dancing — in this case, local Scottish band Canned Haggis provides the soundtrack. The evening starts with a Scottish-themed dinner and Scotch tasting, plus a performance of Highland dancing. After that, the floor’s open for anyone to shake a leg to the Haggis clan. 5 p.m. Saturday. Cherokee Ranch and Castle, 6113 N. Daniels Park Road, Sedalia; 303-688-5555. Tickets are $55 for adults, $20 for children age 12 and younger. Call to reserve tickets. Learn more at cherokeeranch.org.

Saturday through Sept. 30. Outdoor ice skating rinks spring up everywhere in the winter, but where’s the love for skating in summer? FlatIron Crossing has your answer at SummerSkate, starting Saturday. The temporary roller skating rink takes the place of their winter ice setup for the last weeks of summer. Skates are available for rental, including wee adjustable ones for little tykes. 9 a.m. to 9 p.m. Mondays through Wednesdays, 9 a.m. to 10 p.m. Thursdays through Saturdays, 10 a.m. to 8 p.m. Sundays. FlatIron Crossing, Interlocken Loop and FlatIron Crossing Drive, Broomfield; 720-887-9900. Admission is $5 for adults, $4 for kids ages 4 to 12, $3 for seniors. Skate rental is $3. For more information, visit bceproductions.com/summer-skate.

Through August 8. There’s only two weeks left to catch “All Shook Up,” the Arvada Center’s summer musical extravaganza. The show tells a familiar story: A handsome rebel rolls into a repressed Midwestern town and teaches the townsfolk to rock. “All Shook Up”’s twist is that all the musical numbers are classic Elvis Presley tunes. Plus, the audience is welcome to sing along and rock out in their seats. 7:30 p.m. Tuesdays through Saturdays, 2 p.m. Saturdays and Sundays, 1 p.m. Wednesdays. The Arvada Center, 6901 Wadsworth Blvd.; 720-898-7200. Tickets are $47-$57, depending on day and time. To buy advance tickets and learn more, visit arvadacenter.org.

-Kathleen St. John