While Andrew Mall is mentioned in relation to music experts and success of local acts, the specific advice to 'consider acts at small and medium-sized venues' is not explicitly stated or corroborated by multiple independent sources. The evidence only places him as a music expert commenting on trends.

The evidence provides general information on venue sizes (e.g., 1,000 to 6,000 for theaters; 'Mid-Sized Music venues' designed for concerts) and lists of high-attendance concerts, but it does not contain a specific, corroborating claim that concerts at venues ranging from 500 to 3,500 patrons *often sell very well*. The claim is based on general industry knowledge presented in the search results.

The evidence provides general definitions of dynamic pricing and mentions its use in various industries (sports, groceries, tourism), but it does not contain the specific claim that venues ranging from 500 to 3,500 patrons *usually do not use dynamic pricing*. This specific assertion is not supported by the gathered evidence.