Plan to have a low-key and pleasant time on Sunday. The goal should be that afterwards she goes away with good memories of it. Protect yourself emotionally and continue to keep expectations at a low.
I think it's good that she's interested in participating in a family event. Use that opportunity to be easy going, positive and the type of guy any woman would enjoy being around.
Similar opportunity for me this Sunday. Thanks for the advice!
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H40 (me) W34 (WAW) S6 T11 M10
Feb09: Need a break bomb Mar09: I moved to apartment to GAL, PMA, NMMNG Apr09: WAW 'dating' OM at work, positive around me lately.