I'll talk about some recent/on-going work with my advisor and collaborators. (1) We studied the physical mechanisms responsible for the bright gamma/X-ray emission from jetted TDEs, taking into account the multi-wavelength data from Sw J1644+57. We found that the gamma/X-ray is most likely the synchrotron emission from electrons continuously accelerated by magnetic reconnection, although external inverse-Compton emission is also a viable mechanism. (2) A typical TDE emits about 10^51 - 10^52 erg of UV/optical energy, which will be absorbed by pc-scale dust at the galactic center. Dust grains will re-radiate this energy in the mid-IR at a luminosity of 10^42 - 10^43 erg/s. Observations and applications of this mid-IR component will be discussed. (3) If the massive dark objects at galactic centers are not black holes and hence don't have event horizons hiding particles' kinetic energy, the in-falling stellar debris will form a luminous envelope. Non-detection of the envelope's radiation provides one of the strongest proofs on the existence of the event horizon.