From November 10-14, 2025, the Indian Institute of Space Science and Technology (IIST) hosted a distinguished lecture series titled “Interferometry in Astronomy” delivered by Professor Jean Surdej, Institute of Astrophysics and Geophysics Li`ege University, and VAJRA-ARIES Faculty. The sessions were conducted on all the 5 days between 5:00 PM to 7:00 PM at the Council Hall. The series provided a comprehensive overview of interferometric techniques across the Optical, Infrared (IR), and Radio bands. A defining feature of the lecture-module was the integration of hands-on experiments, which allowed students to engage directly with the precise methodologies used in modern astronomical observation. The event drew active participation from a diverse group of students. Attendees included not only those specializing in Astrophysics but also students from various other disciplines, fostering an interdisciplinary learning environment. The lectures covered a wide range of topics with across the lectures - Young’s double-slit experiment, fringe visibility, light coherence, Van Cittert-Zernike theorem, properties and applications of Fourier transformations in the context of interferometry, major interferometric facilities worldwide, coverage of the spatial frequency plane (often referred to as the u − v plane) resulting from the Earth’s rotation, and the fundamental Fourier relationship between the pupil and focal planes, with specific applications to square and circular apertures, detailed analysis of fringe visibility for various astrophysical models, including double stars, 1D Gaussian sources, and 2D uniform circular stellar disks. The theoretical discussion was complemented by an engaging hands-on workshop facilitated by Prof. Surdej. Using simple materials like aluminum foil, cardboard, and pins, attendees were asked to construct handheld DIY interferometers featuring both single-slit and double-hole apertures. This exercise enabled students to observe optical phenomena such as Airy disks and interference fringes from point like sources (flashlight of a smartphone).