The sky's the limit today.

For programmers: Designers and developers will have Baseball Hack Day to pitch, design, code and present websites and apps from 9:30 a.m. to 6 p.m. at CityCoHo (2401 Walnut St.).

For a pageant: Where else can you see men 55 years and older show off their talents and interview skills? Only at the Ocean City Music Pier (Boardwalk and Moorlyn Terrace) at 7 p.m. today. It's the Mr. Mature America Pageant, everybody.

For an astronomical evening: Families can look through a selection of telescopes at Valley Forge National Historical Park's Airplane Field  (1400 N. Outer Lane Dr., King of Prussia) to look at the cosmos beginning at 7:30 p.m.

For an intimate performance: Ms Lauryn Hill continues on her Small Axe tour, bringing acoustic renditions of her hits to the Keswick Theatre (291 Keswick Ave, Glenside) at 9 p.m. tonight.

For one night only: Al Pacino comes to Caesar's (2100 Pacific Ave., Atlantic City) to discuss his career and audience Q&A starting at 9 p.m.

For more Things to Do, check out our calendar for the most up-to-date happenings.