Many introductions and surveys by Borel, I think.
LNM0054 Shimura short introduction
Book: Automorphic forms and applications. IAS/Park City Math. Ser. 12, AMS, 2007.
Various things on automorphic forms and representations in the Automorphic folder under N TH. Also Modular forms folder
LNM340 (Deligne et al) has some really good stuff, for example on modular curves viewed as stack, and on correspondence between adelic and classical points of view.
Harish-Chandra lectures in LNM0062
Jacquet-Langlands LNM0114
LNM0189 Weil: Dirichlet series and automorphic forms. Including some nice history.
LNM0210 Eichler: Projective varieties and modular forms. Studies RR with the Dedekind-Weber approach (which allows for singularities) rather than the Weil approach. Applications to varieties of Siegel and Hilbert modular forms, also def and brief intro to these kinds of forms.
LNM0216 Maass H. Siegel’s modular forms and Dirichlet series
shimura: introd to the arithm th of autom forms
hida: mod forms and gal cohom
Bailey, Knapp eds: Rep theory and automorphic forms (PSPUM 61), AMS, 1997
A week in Strasbourg on cohomologies and automorphic forms
nLab page on Automorphic forms