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The variability of young stellar objects is mostly driven by star-diskinteractions. In long-term photometric monitoring of the accreting T Tauri starGI Tau, we detect extinction events with typical depths of $\Delta V \sim 2.5$mag that last for days-to-months and often appear to occur stochastically. In2014 - 2015, extinctions that repeated with a quasi-period of 21 days overseveral months is the first empirical evidence of slow warps predicted from MHDsimulations to form at a few stellar radii away from the central star. Thereddening is consistent with $R_V=3.85\pm0.5$ and, along with an absence ofdiffuse interstellar bands, indicates that some dust processing has occurred inthe disk. The 2015 -- 2016 multi-band lightcurve includes variations in spotcoverage, extinction, and accretion, each of which results in different tracesin color-magnitude diagrams. This lightcurve is initially dominated by amonth-long extinction event and return to the unocculted brightness. Thesubsequent light-curve then features spot modulation with a 7.03 day period,punctuated by brief, randomly-spaced extinction events. The accretion ratemeasured from $U$-band photometry ranges from $1.3\times10^{-8}$ to$1.1\times10^{-10}$ M$_\odot$ yr$^{-1}$ (excluding the highest and lowest 5% ofhigh- and low- accretion rate outliers), with an average of $4.7 \times10^{-9}$ M$_\odot$ yr$^{-1}$. A total of 50% of the mass is accreted duringbursts of $>12.8\times10^{-9}$ M$_\odot$ yr${^{-1}}$, which indicateslimitations on analyses of disk evolution using single-epoch accretion rates.

Star-disk interactions in multi-band photometric monitoring of the classical T Tauri star GI Tau